Various Group Fly pet mobility glitches

[Fira]

After the changes to Group Fly and pets few years back, despite a patching pass being done to iron out some issues, some still seem to remain, ie:

 * Rarely, issuing commands to airborne pets will have them very rapidly skim toward the ground, or outright teleport to it, before resuming course

 * When deactivating Group Fly while moving, some pets will soemtimes fall down like bricks and remain there. They won't resume movement on the ground until you turn Group Fly back on then cut it off again.

 

These are fairly rare but will happen regularly and can mess up airborne movement especially when herding