Both The Dam and Bill's Town has some f***ed up respawns. A lot of respawns are at virtually the same place, you spawned at right hand side, your enemy spawned at left hand side AT THE SAME TIME.
So it's either you started running first and showing yourself on the radar, get tracked by the other enemy and then he shivved you, or the other way round. You can also hide and wait for your enemy to go for the nearest box, and then kill him.
Honestly, they need a bigger map (or one with better elaborate design) for better respawn points, the original designs were so much better than the current very very small maps like these two and Checkpoint.