Board Thread:General Discussion/@comment-86.164.188.190-20140221013037/@comment-1504072-20140221105010

Liquid does appear to use the hand gestures, and possibly the vocal commands ("BANG", lol), to signal GW to disable/enable SOP on specific targets. Therefore he disabled the SOP-linked helicopter and brought it down, while maintaining the link to his own troops. I don't believe he is actually controlling the triggers of the FROGS' weapons, merely signalling them to open fire in that scene, while also having an over-the-top super villain moment, due to his plan's success.