Melee Pin
If titan A lands a melee hit on titan B before titan Bs melee hits titan A, then titan Bs melee will be nullified(cancelled)
Last updated
If titan A lands a melee hit on titan B before titan Bs melee hits titan A, then titan Bs melee will be nullified(cancelled)
Last updated
If you are being melee pinned (where an opposing titan is constantly meleeing you and thus cancelling your melee attacks), there are two ways to escape it. First, simply dashing away and getting of their melee's reach. Second, you can wait until right after their melee connects, then perform your melee attack while theirs is winding down. This will swap the pin to your favor, forcing your opponent to respond instead.
Sources:
Melee Spec Source: https://www.reddit.com/r/titanfall/comments/njf1wi/comment/gz7au23/?utm_source=share&utm_medium=web2x&context=3 (Thanks Dinorush!)