Collision is rather inconsistent, both between the heroes and the enemies. In V1, collision was straightforward, you could walk through your hero buddies, but bumped into the ratties.
However, in V2, this is rather inconsistent. Both friends and enemies now have collision, but not all the time. I can bump into my companion while moving around in combat, but a second later, I can pass through. This is annoying, because I do not know when I will be colliding with them and when I will pass through.
Same with ratties, I collide with them normally most of the time, but they often phase through me, usually when staggered or in the middle of the lunge animation (when I backpedal, stop, rat goes into lunge, I move forward and our bodies intermingle… disgusting bodily experience). This is especially annoying because this means that my attack that would kill it also phases through and since the enemy is now behind me, I get backstabbed.
Personally, I’d prefer to get back V1’s version of collision (no friendly, just enemies), but if friendly collision is important, then make it permanent. This “mostly we collide, but sometimes we don’t” is the worst of both worlds.
(I hope I’m not the only one to come across this inconsistency and this is not some kind of weird bug that only affects me.)