Catching other players falling is at the same threshold as the guide. If you do slip, don't worry, the fall isn't going to kill you, or even hurt you, directly anyway. Getting separated from the group might suck. Note: only once catch per person per round.
So who is going to catch Yako?
Also, I can post in the IC thread describing successes and failures of this nature, but if you'd prefer to, I'd welcome it. Always good to have some variety in the storytelling, and it helps flesh out the personal styles and habits of your characters.