Oh, I wondered where everybody went: for a moment I thought I had half a dozen or so fairly hardcore allies behind me, and then... nothing. I somehow scraped through the fight by accident thanks to having most of my party still on the wrong side of the doorway when Alexander cast his blind spell and then levelling up just as two or three of my party were getting a bit low on health. And a couple of resurrection scrolls.
I kinda feel quite cool about getting through it, but I admit that actually I totally suck at combat and strategy and it was definitely a case of more luck than judgement.