Theory: SO you all should know that dovepaw and boulderbatch have a hate relationship so I think this might be it seeing that dovepaw is always nervous around boulderpatch maybe its because she accidently got him crushed by a boulder. Also since dovepaw was crying at the middle/beginning does this mean that boulderpatch might have done something to make he upset seeing that at the very beginning he was looking a little mad so maybe he did something that took out his anger on dovepaw upsetting her and causing her to try to run away causing the boulder accident
thanks @9rainbowtails for the great source for a theory (Also sorry that the theory is so messy)