[From the sound of it Owen would have thought there were several people in here training, so he has to pause in surprise upon opening the door and noticing that, nope, all that destruction is coming from one person. It looks intense enough that maybe he shouldn't disturb her. He can always come back later, despite already having changed into his judo outfit.
He does take a moment to do the Owen version of staring (read: look on impassively) before making any move to exit, though.]