Yes, definitely sensed. In canon if another magic user shakes hands it can be felt. Yeah... Harry had fun with Sue. Rode her into battle. It was a blast.

I just thought of this too. As a wizard, Harry heals fully from any and all injuries he gets. For example, broken bones heal completely with no mark that there ever was one. Over lots of time of course. No idea if that is relevant, but I figured it was medical so I'd throw it out there.