I've been playing PL for almost a month now and I'm stuck with some questions to ask, any replies will be greatly appreciated

I. When someone challenge me to a 1 v. 1 duel, they keeps on complaining that i've rushed? Ok first of all they want to PvP with me and now they're blaming their loss on me? I mean it's just a game you have no need to get fumed at ppl. Why are they acting like that all the sudden?

II. What is weapon Proc. and what does the 'Nightmare" combo do?

III. And finally what does energy orbs do?

Thank you.