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It's a tricky question. Before this, Stefan combined with Emma provided a very good strategy against all these mages, but now we need Rainhild. That's correct.
On the other hand, doesn't Goran accidentally hit her with his blast? And he can't not blast, otherwise Rainhild won't get out of that room in a reasonable amount of time. And even if he doesn't hit her, what about the archers? They'll burn her again...
If Tyril's flash is recharged, I'm ready to send her to her death and kill at least those mages without a mirror with the flash (I thought there were some, but it's better to double-check). I hope she will recover with Delia or someone else... But otherwise, things look really bad.