Running a new campaign, trying to stick with standard Pathfinder ruleset (no homebrew). Wasn't sure how to resolve this issue that came up during gameplay.
The party is in a cornfield, riders with torches are trying to set fire to the field to flush them out into an ambush.
A 2nd lvl Ninja states that she is going to use her ninja trick "Acrobatics Mastery" to leap at one of the horsemen and knock him out of the saddle.
I wasn't sure what the DC should be on something like that, and I felt like she would have to make two rolls, one for the acrobatics check and one to do a grapple or something similar to pull the horseman from the saddle. Much arguing ensued and for the sake of expediting gameplay I allowed her maneuver with just the acro check.
Advice on what the proper disposition of that situation would be?
Thanks
E