Rolls: 19 to escape; 20 next attack. He'll use cleave, for the chance of doing additional damage to the other one, if he or someone else should be adjacent.
rolls:
http://invisiblecastle.com/roller/view/1669800/
If possible or needed, Wittgenstein will shift (twice) to avoid being flanked by the crabs (with present positions that would be to T or S 13), but at present am only attacking the one (who is marked).
OOC: For what it's worth, I have no problems with you making any rolls for me if it speeds things along.