Crusty misses with his bite, but hits three other times in spite of the invisibility. Total damage is 35-30 (one claw did no damage at all). Hyp is too big to grab.
OOC: No need for a spoiler block - I'm curious too. Crusty has tremorsense, but would he still not have a 50% miss chance for total concealment, or is the wording such ("pinpoint") that it skips the concealment?