I have new character coming into a campaign played a druid. His plan is to control opponents through both grappling and trip. So far the only thing we don't have clear answer for is what happens if he or his animal companion is grappling a foe and the other one successfully trips it. Normal it would fall prone, but if it is grappled by another is this still true. Also, what happens to the grappler since I don't believe he can release the grapple until his next turn in the sequence.