No, the game freezes only if you use, well, Freeze. And summoned creatures, I believe. The scorpion trap counts as such.
My mage froze the Demon of Lies, and kept shooting meteor strike at him until he was almost dead. Then I let him unfreeze and finished him off. Alternatively, my mage just kept casting meteor strike at the Demon until he died, ignoring all the other monsters he summoned in. (Decent armor, good resistance, plus shielding spells.)