In-Game Name:Thenessa
Proof: https://youtu.be/IS6gZZl_ZQc
If Video what time was it? 0:47

Hi xD

He's been banned.
Thanks for reporting!

NeedBlueberry:

In-Game Name:Thenessa
Proof: https://youtu.be/IS6gZZl_ZQc
If Video what time was it? 0:47

Sometimes run fast in sneak mode is a glitch, this happen 1 time when I'm in my playerserver. I'm walking without sneak in my screen, but in my friend's screen I'm sneaking with none sneak speed.

In this case he was hacking. phsyco and I were there when he hacking, we both watched for a while and we both agreed he was hacking and not a visual glitch.
Here's a thread about it. https://hypixel.net/threads/what-kinda-glitch-is-this.559479/#post-5405320