He may not be the best at reading expressions - it could be said that he spent too much time around books to do so. But... she doesn't look particularly sure.

"... I can aim it, if you're worried for that. Its just that everything else offensive would.. be a bad idea from me. ... and Laulyse isn't suited for poison types..." Or, well, he can see how much nearby her is easily nudged and rolled closer. Here, a few more small pieces of rubble.