Hi there,
I do not know who played you or your brother. But for sure you or your brother used Aimbot.
I have just checked the demo you sent me and who ever played he had some hotkeys on the Aimbot, to turn on and off the auto-aim.
Not only auto-aim is to see in the demo, also trigger bot since, as human the player turns fast to the zombie direction and shoots automatically.
In the demo: (Few proofs)
From 01:17:00 - 01:22:00 auto-aim
From 14:17:62 - 14:20:00 is crealy possible to see 100% auto-aim and trigger bot.
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