
Darn, looks like it is only certain types of collision.
I was hoping it was all alias vs. alias model, but I am standing on the top of the grunt.
Projectiles --- I can understand but maybe that can be altered ... a task for a rainy day.
[One gem I noticed that your interpolation doesn't have the classic "load a game and see frame 0 for a split second problem" -- JoeQuake doesn't either but I haven't been able to determine what change or why from there.]