KNIFE SPARK HACK?/MOD?

[KingDot]

Hey guys. I'm sorry I couldn't add a picture. My comp die right after I was playing a game. Once I see the same HACK/MOD i'll take a screenie and post it right away.

Anyways, I was playing death room CTF when this blue flashing starts happening.

The person had a knife out and everytime he does the knifing action, blue sparks flew out. Sort of like a blue firework leaving a trail of blue smoke too.

Anyone know why???