Shooter #1 (nest) pushed the fleeing crowd North, while Shooter #2 (ambush) was positioned to target those that were fleeing the area.
For more details check out the post below.
Las Vegas Shooting: Shooter #1 & Shooter #2 Position Map
https://steemit.com/conspiracy/@budz82/las-vegas-shooting-shooter-1-and-shooter-2-position-map