He's absolutely leaving out the part where he was tied to a large rock and tossed in a lake on purpose, because she's sick and does not need to hear about that right now or possibly ever. He's known to be pretty careless; she can go on thinking he fell in a river or whatever she's assuming, he's even done that a couple times here already.

"Using a lot of spells, usually? Or just a few really strong ones, like the one that turns you into a dragon - but hey, I won't ever have to learn that one now, that's a huge timesaver!"

Here they are, at the door. Popp doesn't appreciate the work that goes into decorating but he does clock all the pink as cute and characteristic of Rosie. He's worried enough about her that he's not having nervous jitters about going into her house and seeing her bedroom that he would in just about any other circumstances.