Soooooo...am I assuming you've cross tied him higher/tighter, or that you've just started cross tying him? That's not a solution, that's a cover up. To me, your horse still appears REALLY PISSY while tied, and you did one of the worst things you can do with a horse who has bitten that badly...you stood (for quite a while) and crossed right in front of him where he could easily have grabbed you. Now if the actual biting issue hasn't been addressed, him being cross tied is still him being a loose cannon waiting to go off. JMHO
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."