Don't forget about desync freezes! I was going to mention this earlier,
but I wasn't sure if my info was accurate. (still not completely sure, I remember talking about it with Matt last year...)
You can get up to 4 ATA rolls on each target in 4 player games if the projectile connects on each client, meaning that 50% chance to freeze on something like CCA sinows can actually end up being very likely, as it rolls 4 times, so (0.50^4), a 93.75% chance to freeze. Of course, there are times when only 1-2 rolls will happen, but this still increase the chance by a large amount.
>This is also why you can freeze many monsters that you aren't even targeting with Snow Queen