Lapistia

If we could easily wipe out half the enemy force and weren't here for the main quest, then sure, we could go after the sorcerer. But as long as there's a risk of the first scenario, 25,000 won't compensate for the loss of a hundred units and the destruction of the squad.
Although, I wouldn't mind...

It's pointless to go after the sorcerer without gathering information. How many would have died if we had attacked the snake creature head-on without scouting first?
The Ishnadian sorcerers may not be as large and powerful, but they are definitely more cunning. It's worth understanding what to expect from them beforehand. Otherwise, I wouldn't risk it.