do engineers have combos?

[SuperNas]

I looked on the forums to see if there's already a thread bout this. I didn't see one, so mybad if I'm reviving a old thread lol no pun attended. Anyway, 2 days ago while on a run in slouch with a few guild members I believe I came across a combo...I'm not sure though and don't remember in what order I sent the skills...it was something like wither, transfer, and decay...I saw the words combo on the screen...I asked who was it that did the combo but no one else seen it....was this a glitch maybe?