It's a bad start from an awkward position, but there's enough bat in his brain that Peter gets himself upright midair and fills his wings with wind...just as the TARDIS's leg comes forward and hits him like a giant wall of bony flesh. Any chance he had at staying airborne is dashed, the wing on the side she hit crumpling and sending him falling like a very small stone. His impact is cushioned a little by the grass, but there's little more he can do than lay there, dazed, as enormous hooves impact the ground around him.

By some miracle, she misses him. Peter groans and reaches up to rub his head, but hisses in pain and stops moving again even before he can realize the motion doesn't work very well with wings. "So much for not hurting me," he says with a bitter laugh.