[Triggvi]

the big thing to remember you are all friends at the end of the run. If his behavior is bothering you talk to him privately (this shows respect for the person as both a player and a friend). Tell him arguing at the table is robbing other people of there fun and time in the lime light. Ask him to chat with you after the game about rules problems, but during the game you have to  make decisions to keep the game going for the fun of everyone else.  If you change your mind after the game, you will make it up to the character next game somehow.  This gives him an way to address issues and get a remedy without holding up the game.

[Prodigy]

Listen, do not let players run your game. If you need to pull a player aside and speak with them about behavior so be it. The goal of every ST/DM is to make the players have fun. Rules lawyers and argumentative types ruin games. Control of rules and the flow of the game is your domain. Control it and make sure the players know you are running the game for the enjoyment of all.

[All4BigGuns]

Has no one considered the 'devil's advocate' scenario that perhaps the more experienced GM is trying to help the less experienced one be better at running?

[Triggvi]

Has no one considered the 'devil's advocate' scenario that perhaps the more experienced GM is trying to help the less experienced one be better at running?

If he is a more experienced Gm then he is showing it in a very poor way.  Respect goes both ways. If he wants to show the less experienced Gm how to do it better,then he should respect him and chat with him privately, not disrupt the game and make everyone miserable.

[Critias]

Has no one considered the 'devil's advocate' scenario that perhaps the more experienced GM is trying to help the less experienced one be better at running?

There's a time, place, and method to devil's advocating, that keeps it from just "being a dick."  Done poorly, the two things are absolutely indistinguishable. 

[Triggvi]

Has no one considered the 'devil's advocate' scenario that perhaps the more experienced GM is trying to help the less experienced one be better at running?

There's a time, place, and method to devil's advocating, that keeps it from just "being a dick."  Done poorly, the two things are absolutely indistinguishable.

very insightful, thumbs up

[Crunch]

I think this one comes down to communication again. As an experienced GM, when you get the chance to play it's doubly important that you not undermine the GM or disrupt the game through argument.

Now taking the GM to one side after the session and saying "Hey I think we should check that rule" is a totally different thing.

[lurkeroutthere]

Has no one considered the 'devil's advocate' scenario that perhaps the more experienced GM is trying to help the less experienced one be better at running?

No, in part because the GM came onboard asking for help with an argumentative player. If the player needed assistance dealing with a hardnosed GM I'd phrase things accordingly.

I mean no offense BigGuns, I know you have a player's side of the GM vs Players mentality. But ultimately I believe that people don't usually GM just to be power mad dictators eager to crush their players ambitions under their steel shod boots. It's been my observation that GMing is more often then not kind of a lot of work and often thankless work at that. So I for my part tend to error on the side of caution. Ultimately however there is no great divide, everyone should be at the table playing their chosen or defacto role, and communication and mutual respect must be the norm.

[All4BigGuns]

Has no one considered the 'devil's advocate' scenario that perhaps the more experienced GM is trying to help the less experienced one be better at running?

No, in part because the GM came onboard asking for help with an argumentative player. If the player needed assistance dealing with a hardnosed GM I'd phrase things accordingly.

I mean no offense BigGuns, I know you have a player's side of the GM vs Players mentality. But ultimately I believe that people don't usually GM just to be power mad dictators eager to crush their players ambitions under their steel shod boots. It's been my observation that GMing is more often then not kind of a lot of work and often thankless work at that. So I for my part tend to error on the side of caution. Ultimately however there is no great divide, everyone should be at the table playing their chosen or defacto role, and communication and mutual respect must be the norm.

He also admitted to being the less experienced GM. I merely stated a possibility with no comment on which I thought more likely. I have noticed that when people come on asking for "help with a problem player" that most responses tend to be advice to go "I am GM! RAWR!", and really other things need to be suggested.

[Black]

True. I think the best bet here is communication. Then again, that's almost always the best bet.

[1Red13]

Certainly no one wants an unruly player taking up too much time, but you do want to be on the right side of the rules as well.  It only takes a minute to look up most rules.

If its taking too much time to find the rule say "We can't find it right now.  For now we will go with how I interpret it, and after the game we will look it up further. and do things differently if I'm incorrect."

As All4BigGuns indicates a new dm can fall into trap of being overprotective of the game their running.  Take a deep breath quickly look up rules and then move on doing the best you can.