There is enough time in the altercation to have both. "You [have a problem] now" as the first punch is thrown, then, when Z's gun is revealed and TM attempts to take it, TM saying "You're gonna die tonight." 45 - 75 seconds between the two remarks. From 911 calls, there was an argument, words, not just fighting.
That version is what I understood Zimmerman’s family to be stating.
You guys know too much. Best be looking over your shoulders when crossing the street :)