What hacks do people use in Fireteam?

I went into a Fireteam game, and some guy just stayed at the starting zone, and was killing people all over the map without moving.
What hacks was he using?

they use a hack called OPK its a vip hack that u have to buy it gives them the ability to show up on the zombies direct spot and kill them those hacks usally cost about 20 bucks a month

Wut he said.

And uhh if those hacks are used in Desert Thunder, you're banned.
Cuz of the Patrols. When you kill them it's like a autoban. :P