Considering the state the two of them were presently in, a weak blast was enough to force even Trowa to overbalance, his leg unable to support a highly unplanned shift in weight while standing on bark covered in ice and snow; with a grunt, he slipped and rolled off the thick branch supporting him, landing instead stomach-first and draping over the one below with a great whuf of escaping air.

Add some heavy bruising--both flesh and bone--and a bloody chin to the list of injuries. Oh, and some splinters. They're gonna have fun patching him up afterwards, that's for sure. At least it's not like he doesn't already have scars everywhere?

Pulling himself up to a sitting position and clutching at the trunk, using the sheer size of the war form, he shook the tree, trying to dislodge Starscream--and a hell of a lot of debris--from his not-quite-comfortable perch some distance above.

Cut off the retreat path. Corner the enemy.

Never mind that the even that monster of a branch was beginning to creak underneath the massive beast's weight.