What gave it away?
I guess that's kind of the story with all overheads though. Half the time I get hit with 4B, I am waiting for it, I see you do it, I push back to block high, then it never comes out and I get hit anyway. I'm not sure if that's lag or just me still reacting too late; the lag is not really an issue usually but that situation might be so split second that it still makes a difference. Or I block high then for some god forsaken reason I just reflexively go back to downback a splitsecond before it connects.