Sajaa:
OOC - If we can skirt these and continue on, or hop over them without risk of bursting them, my vote is we continue on.
I don't think I did a great job of describing this cave. There aren't any actual exits to this cave other than the one you came in through. The only way you haven't fully explored is in with the big mushrooms and the rats.
As for the grip stuff, MA 111 was a great reference, which brought up a lot of different grips. I'd never really looked at defensive grip before I don't think.
I think the short and skinny is, if you want to use a different grip it requires a ready maneuver in between, though it can be done in conjunction with a ready maneuver for any other purpose (drawing a weapon, changing weapon grip for length, etc.).
Without changing grip, I think the effect of the 'two hand' bonus can be gained with a committed attack, which can add +1 to damage with a -2 to defense (though it removes the ability to parry/block with the weapon you attacked with, or dodge if you kicked).