The hellcat sucks in some spores on the way over (rolled 22 Fort save) and loses 3 Str and 2 Con. It now has 20 Str, 15 Con, and 52 hp.
The hellcat claws once and bites, missing with the other claw and both rakes. (Lowest hit 24-1+2 for invis, highest miss 19-1+2) Tinder takes 20 points of damage and has 331 hp left.
Round 844: Tinder rolls to 40N60E. The hellcat can take an AoO at -4 or try to dodge for half damage.