A hacker if I've ever seen one

So I just started a round of invasion. So I go to the midlle, see a spartan, try to attack him in the back, do it 3 times. I get a suicide, spawn, then get told everyone quit, then I cant do MM. Thoughts?

Not a hacker. You happened to see a guy right as you were lagging out, which results in nothing happening on your end AT ALL besides your movement.

If you can’t play MM right now but you can post on here, something fishy happened to your Xbox on the network end. Just unplug your modem and router for a few if the problem persists.

not a hacker, you just lagged out.

When you lag out everyone except you stops shooting and continues what they are doing in a straight pattern (walks forward or stands still).
During the few seconds that your game doesnt realize youve dropped connection, you can move shoot and fire, but bullets and melees will not register.

After you lagged out you most likely got a quit ban.

He probably dash-boarded and was host.