Underfoot Assault (Ex): At 1st level, if a foe whose size is larger than the mouser's is adjacent to her and misses her with a melee attack, the mouser can as an immediate action spend 1 panache point to move 5 feet into an area of the attacker's space. This movement does not count against the mouser's movement the next round, and it doesn't provoke attacks of opportunity. While the mouser is within a foe's space, she is considered to occupy her square within that foe's space.
While the mouser is within her foe's space, the foe takes a –4 penalty on all attack rolls and combat maneuver checks not made against the mouser, and all of the mouser's allies that are adjacent to both the foe and the mouser are considered to be flanking the foe. The mouser is considered to be flanking the foe whose space she is within if she is adjacent to an ally who is also adjacent to the foe. The mouser can move within her foe's space and leave the foe's space unhindered and without provoking attacks of opportunity, but if the foe attempts to move to a position where the mouser is no longer in its space, the movement provokes an attack of opportunity from the mouser. This deed replaces opportune parry and riposte.
While using Monkey Style, if you successfully deliver a Stunning Fist attempt, in addition to the normal effect of Stunning Fist, you can spend a free action to enter a square adjacent to you that is within your opponent’s space. This movement does not provoke attacks of opportunity. While you are in your opponent’s space, you gain a +4 dodge bonus to AC and a +4 bonus on melee attack rolls against that opponent. If otherwise unhindered, the opponent can move away from you, but if he does, he provokes an attack of opportunity from you even if his choice of movement does not normally do so.
Q1: Do you gain the benefits of both feats as long as long as you are in an opponents square, or does only the one that triggered your entry into their square work?
Q2: If both work, do you get two attacks of opportunity (assuming Combat Reflexes) when the opponent moves out?
I believe that the effects of both would work as long as you're in the opponent's square, regardless of how you got there, but I don't think it would trigger two attacks of opportunity since they're both triggered by the same action and are similar effects.
I'd like to see what everyone else has to say on it.
I agree.
Both abilities' bonuses should apply while in the enemy's square.
Both give an attack of opportunity for movement, this is still only one attack.