Man that sucks getting a surprise like that Star, I feel for ya,
I always connect gauges when messing with it so if I need to catch it I can and they're there ready to pull a vac and recharge afterwords.
We were doing an R&R in an AT&T tower and the tech I had working with me had the same thing happen. Man as soon as that flame hit the line, POOF!!!!!!!!
Dont let it get to ya, know one was injured and thats whats important