Mychasi has an up angle of 60 degrees, so he must fly 50 feet laterally to go up 75 feet. He can be at 110N25E75Z, travelling north, if he wants to avoid the opposite entry of the arena.
The bats go sleepy-bye ("good day, dragon" (instead of "good night", because bats are nocturnal) (rolled 12 Will save), and plummet to their deaths.
Mychasi can breathe again in four rounds.
A green, extremely thin, bipedal creature covered in short bristles with clawed hands moves into the arena to 110N90E, and launches a cluster of its bristles at Mychasi, wildly missing (rolled 5-10=-5 for ridiculously long range). Go ahead, Mychasi.