Oh darn! I thought I had 1 more turn to fly but forgot I spend 1 turn in ground hoping someone hops a bat so had effective 8 rounds and 30 secs = 5 rounds spend. So 3 turns left when spotted carriage....wait...I should have 1 turn left? Or does expire mean she dispelled the one bat and thus both go? Note that dispel magic only banishes the said individual bat, not entire spell.