The sneak chooses to try rushing past, and push August out of the way.

Spoiler
Show
First he provokes an AoO from Aerin. If that doesn't knock him out, he tries to Bull Rush August 5 ft. backwards.

August's AoO: (1d20+2)[21]
Damage: (1d6+1)[4]

If that misses, opposed Str checks
Enemy: (1d20-4)[1]
VS August: (1d20+1)[14]