Beorn...not feeling particularly threatened any more, will just try to keep closing and biting, skipping the invisibility.
OOC: Does Beorn have regeneration 2 or 4?
OOC: The regeneration is 4, which only occurred one time (31 hp to 35 hp). Beorn has a maximum of 37 hp.
Round 315: Bird resists the poison from an earlier bite. Beorn charges to 5N110E5Z and bites for 2. Bird runs to 110N110E and Beorn misses the AoO. Bird has 10 hp.
Round 316: Beorn flies to 110N110E5Z. The bird misses the AoO and runs to 110N0E. Beorn misses the AoO.
Round 317: Bird takes another 3 Str from an earlier bite. Beorn flies to 5N5E5Z. The bird misses the AoO and tries to run to 0N0E. Beorn bites with the AoO for 1 plus 1 Str! The bird has 9 hp and 0 Str.
Beorn goes first in round 318 and has a chance to position himself before a new opponent arrives.
Beorn, not really knowing what to make of a pack of bugs (other than say, a nice smoothy) flies to 35n 75e 10z and tries his Wounding Curse (which, I presume, will fail outright...but I'm betting ol' Beorn is not a swarm-o-bugologist).
Counting on his regeneration to keep him safe, Beorn drops into 25n 65e 0z (still flying, not that I think it will help...) and tries to chomp a few morsels from the pack, hoping for a snack and to break it up.