Hackers report. Everyday. With a crappy internet connection. And please TannerLittle, update NCP please.
You can tell by strafing, if they still hit you without looking at you it's kill aura. Also if they hit you farther than 4 blocks. Another easy way to tell if they are near a chest and they keep hitting it, but that's only on some servers. Edit: Also notice the speed and if they have other hacks on like No Slowdown, it's most likely they will have Kill Aura if they have No Slowdown.
With skywars the most common is anti-knockback and kill aura. It would be useful if I could tp to people who are hacking but I guess getting people to record is the best I can do. You don't need to upload huge videos either, just cut to the little segment they hack or if you have bad internet I would use the gyazo gif maker tool to create a short gif showing hacking
That'd be good, like for staff. There's a little popup you can use by doing a command, (kinda like /servers,) and it tps you to spec a certian game. ;p