Battle Oracles and Mounted combat

[Tom4444]

Quote:

Surprising Charge (Ex): Once per day, you can move up to your speed as an immediate action. You can use this ability one additional time per day at 7th level and 15th level.

Lets say a mounted battle oracle decided to activate this ability. Does his mount get to make the immediate action move, or will he have to leave his steed behind?

[Fuzzy-Wuzzy]

Some GMs might allow the mount to take the move, but RAW he has to dismount first.