Okay, I have a dimension door SLA, I can also get blindsense and another evolution with a single casting of greater evo surge.
So if he went invisible in the surprise round I'd grab blindsense. I'd also cast improved invis, except I can find him a lot easier than he can find me. Etc. Yeah it would be a rough fight and there's a good chance I might lose. That's the whole point.
If the whole thing would be over in two rounds or whatever than what do you have to risk beyond a couple days and a few posts worth of time. Let's get it on!