Yes, let's dunk Jess in water until she stopped struggling. Did Tony have neighbors? This had lifetime movie written all over it! What they needed was knock out gas of some sort. But considering they weren't in an Episode of get smart and anything close to knock out gas was considered a WMD Bruce had to settle for knocking Jess on the head.
"Just don't-" He paused as they reached the glass door to the pool, there was Jess...pulling off her shirt."Um...don't give her a concussion."