Thanks v much for all the tips and encouragement, Dundee! Will go try the methods, especially entangle.
I wouldn't have felt so bad if it were a normal trap, but it had to be a special ability that caused most of the damage and I knew that by right, party members should not have been on such a high level at that point (although it can also be argued that TOB lifted the XP cap and not me).
My only consolation is that I got to see how powerful spike traps are. So in TOB, Jan is definitely staying on