If you and your mount both have acrobatics, and you wish to use acrobatics to move through a threatened square: Is it possible to do so? What check do you use?
I can see a couple possible interpretations:
1) You use the mount's check
2) You each make a check, and you fail if either of you fails the check.
3) You each make a check. The mount failing means it is unsuccessful. You failing means you fall off the mount.
4) The mount makes an acrobatics check and you make a ride check.
5) It cannot be done.
Does anyone know of anything to support one of these positions? Or have another interpretation?