Refills till 50, resets to 100 next round
Or it doesn't regen but the uptime on sprint is increased significantly
Or getting a kill/assist fills the bar partially
Mix of refills till 50 and kills/assists filling the bar makes it unique and fair since if you're a good neon you should be allowed to sprint a lot and is a nerf to bad neons
better than refreshing every kill. a bit insane that this ult can last from round start to finish when no other ult has this much presence other than viper ult, but at least you can outrun a viper's pit