Most relevant for Aurelia as she can freeze left and right with Bitter Riposte and Shard (action skill) and ice fragments and super high chance to freeze in general from Chronicler COM and Avalanche, but other chars can use vladdov ice grenades and freezing slam Oz kits and frozen shields too …
EDIT: yup , quite ridiculous on Timothy/Jack chucking homing grenades 90% of the time and sniping the frozen statues with godly crit modifier 
. And frozen Novas on his digi-jacks
EDIT2: Sort of Ridiculous on Nisha too. Chronicler boosts her Tombstone skill. So mass (homing) cryo grenade spam - increases the damage of the cryo grenade pulses (sort of like Just Compensation does for timothy ). And with all that crit chance boost her showdown has cirt spot AUTO AIM : ) on cryo beam laser … auch !! (keep a beam laser on hand for too much shield encounters)
So one can freeze a few enemies AND SHOOT NON-Frozen enemies with increased crit multiplier. When one goes to removing the frozen enemies it should do so in order of decreasing enemy HP since the crit multiplier goes down with each kill vs frozen target (and your maximum damage per shot with it ).
Test results:
(default with weapon/skills/grear) Crit Multiplier = 3.73477745
1 frozen test dummy Crit Multiplier = 7.73477745
2 frozen test dummies Crit Multiplier = 11.73477745
3 frozen test dummies Crit Multiplier = 15.73477745
Calculation/Verification:
Test weapon was arctic hyperborean SMG. 5/5 Markswoman ; 8/5 Cold advance. 0.087388515 BAR crit.
2 * (1 + 0.3 + 0.48 + 0.087388515) = 3.734777
2 * (1 + 0.3 + 0.48 + 0.087388515 + 2 * 1) = 7.734777
2 * (1 + 0.3 + 0.48 + 0.087388515 + 2 * 2) = 11.734777
2 * (1 + 0.3 + 0.48 + 0.087388515 + 2 * 3) = 15.734777
