Ouch.
I wonder how the people in London will freak after Touma's Imagine Breaker gets sliced off and the Invisible Thing comes out. They'd be even more freaked that he can stop it and that his arm grows back completely normal.
I just thought of something.
What about Ollerus? Now that Touma is in the middle of the Magic Side, what's stopping the dude from trying to recruit him? I think that he would try to tempt Touma to his side with the promise of information on the Imagine Breaker and the Invisible Thing.
Keyword: try.