Here's my take on both the current and any new "sort out the time jumble" missions. Given that they are supposed to be more "puzzley" than other missions, why not tone down the combat aspect of them? In khadgar-land
Minor Anachronism -- "You must usher the monsters back to their own time," the mission sign informs you. You enter the mission, and are informed that the jumbleometer is at 50% jumbley. You shoot a seize spell at the sea worm invading the lava flats, and they it freezes in place. The jumbleometer drops to 41%. Good work! You see a fire bat heading towards you. You always hated those things. SEIZE! The bat explodes violently, and the jumbleometer rises to 68% Oh crap, you'd better be more careful in which monsters you warp out of the time jumble!
Major Anachronism -- "Stop the time jumble from getting worse by defeating the invading monsters!," the mission sign informs you. You enter the mission in the lava flats. This terrain is unlike anything you've seen before. It's half lava flats, half abandoned town! An urban crawler rolls into the lava, unfazed, and begins shooting at a utahraptor. It handily defeats the utahraptor, and the message log informs you that the jumbleometer is at 15% and rising. You dispatch the urban crawler, hoping for a reduction in the jumbleometer, but it doesn't happen. Looks like you have to defeat all the invading monsters before the local monsters are entirely wiped out.