As the oose gets closer, Gashur tries to rip it apart, going for more damage first, and for minimizing his contact second, shaking his hands violently after each strike to get the acid off them.

Spoiler
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Claw AoO: (1d20+11)[28] for (1d8+11)[18] ref (1d20+4)[13] (having natural reach now)
Claw: (1d20+11)[28] for (1d8+11)[16] ref (1d20+4)[22]
Claw: (1d20+11)[30] for (1d8+11)[17] ref (1d20+4)[10]
Bite: (1d20+11)[14] for (1d6+11)[16] ref (1d20+4)[9] (if it comes to that)