When to face Diablo?

[internetdotcom]

My opinion, you should use 'em both.  Though you won't be hitting as often as you like (he's got something like 57 percent chance to block all physical attacks, if I remember correctly), the chance that you'll hit with both of them in effect isn't too bad.  Even if one wears off, you'll likely have the other still on there.

Yeah, I just hope I dont charge them both up, then lose the charges as I have to run from one of his attacks.