On the second - a, it was a joke, b, you do realise I'm British, right?
Checking if setting mines really would blow holes in the ship: (I was guessing, old ships like this were built with lots and lots of steel, so it could take it.)Engineering (10d6.hits(5)=3)
Good location to spring a trap (if possible with explosives), preferably one where the ships minigun can fire at too.Tactics (11d6.hits(5)=5)
"Can not predict movement of crab, but explosives very predictable if you know them.", Wagner replied, emphasis on "know". "Mines on deck will not blow holes. Thick metal will bounce explosion back and hurt what is above even more. If we set ambush on landing pad where deck is strongest and inside range of machine gun we captured, we can take out crab without risk of death on a guess that it moves slow."