A 16 hits, 8 damage.

As Turi tries to stand, he sustains AoOs too, from the two gnolls but not the blind hyena:

Gnoll #2, scimitar (includes favored enemy bonus, flanking, no TWF penalty) (1d20+15)[16] damage (1d8+6)[8] cc(33+) (1d20+15)[25] cd (1d8+6)[13]

Gnoll #4, scimitar (includes favored enemy bonus, flanking, no TWF penalty, prone penalty) (1d20+11)[13] damage (1d8+6)[13] cc(29+) (1d20+11)[23] cd (1d6+6)[10]