I suppose you had a very young player there who was simply too young to play SW:TOR unattended in the first place.
"Zero Communication" happens, and sometimes is not a problem. There are instances when I mark a mob with a lightsaber and call out: "I'll cc the ligh... well, nevermind." The tank rushes onward, the mobs are dead within seconds, everything is fine. There are quite a few players who actually seem to believe that talking about simple flashpoints is beneath their dignity.