Perhaps this is part of the game mechanic, but I noticed that certain objects have an effect on other objects simply by being there, for instance, the crossbow doesn't shoot the same if a portal exists near it, also 2 opposing trampoline's cause a difference in angle velocity verses two facing the same way. Both aren't hit, but one simply being near the other changes the distance. Bug maybe?
 "Ragdoll Achievement 2"){kind=icon}
 "i saw her standing there"){kind=icon}