It takes two for a collision.
Both planes should take damage.
With exception of bullets being fired, I find it hard to believe that when two planes cross (+) & slap wings that one would fly away.
Last week me and a plane were acm'n and we came back at each other, I was banked vertical, and he was horizontal. Neither of us fired our wings crossed only, I flew away and he died that seems that would not happen in actual events. We should of both been pistol fighting the whole way down.
Two planes hitting each other no matter what speed or angle should send them both to the ground. Unless you want to get into metalergy and the thousands of different scenarios of wing v.s. tail, wing v.s prop, tail v.s. tail, wing v.s. body, etc.........
Although it's probably happened before due to probability, there is video to support the theory that when planes collide they both go down. Do a search on google of plane to plane crashes, 95% of the video you will find both planes blow to pieces and the pilots are lucky if they can bail out. I could not find one where one plane disentigrates and the other fly's away unscathed.
I realize most of those films are not old school prop planes, and going 200-600 miles per hour faster. But consider car wrecks going 80 miles per hour, can they run into one another and drive away.
More times then not they both go to the junkyard.
If collisions more times than resulted in both going down, it would probably reduce the blatant HO's.
JMFJ