Jonathan blinked, staring at the man for a moment. Last he knew, he and Joker were not on the best of terms. Then again, Scarecrow wasn't on the best of terms with most of the Rouge's Gallery on any given day...something about spraying your partner's with Fear Toxin and watching them scream.
Excepting of course, Joker...again. The clown commonly seemed to be a wrench in the works.
However, considering their past working together...minus the whole beating with a chair bit...was enjoyable enough, provided the Clown Prince had grown a brain cell or three since that time.
"I was rather wary of touching something you might have trapped," he said, tones cool, but even, not trying to provoke Joker, simply point out the most logical conclusion.
He turned on his heel to follow Joker, assuming by the man's comments he was permitting Jonathan to do so. If not, he was quite sure the clown would be more then happy to rectify the error...probably painfully.