This last part is IMO key.
I agree, in so far he wasn't panicking or something like that. The problem here is that he took the calculated risk at all, and IMO like most wizards overestimated his ability over "a mere sorceror".
He shouldn't have risked the gate, not even for Lirian and he for sure shouldn't blaze out against an lich sorceror. That is one or perhaps the fundemental flaw in Dorukan. When considering protecting gates and not things like being an emotionally balanced human being.
Every single time a wizard has though "wizards are better then sorceror's I can take him" Xykon wins. Because the wizards arne't using the strengths of a wizard and effectively playing Xykons game of strength and brute force.
On another note all the gates seem woefyull weak against actual physical harm. If we consider that the gates are needed to shore up reality Lirian's got torn apart by trees running from fire. Dorukan built a self destruct into the castle. Miko smashed through Soon's gate and Roy whacked Girard's. Most of the defences tried to protect against possession, yet all have fallen to outright destruction instead.
I've seen no real impression that this is the case. RC and TDO may think this can happen, I question if they really know anything what they are messing about. TDO clearly isn't too well informed about what is going on since he's not talking to the other gods. Which means that everything we know about TDO's plan, RC supposedly follows and even he hasn't spoken to his god, rests on hearsay. The problem with the entire plan is, that it seems the other gods can just unmake reality before RC and Xykon could complete the ritual.
I can't remember seeing if the other gods are are even worried something like that can happen, obviously they can be blindisded, but seeing how many worlds the gods been through, I kinda suspect TSO knows less than TDO thinks of reality.