I was playing this private server with my friend, Xerin no problems but then when this guy ninjaturd came in and disconnected, the server got DDos.
Please look into this matter.

well i would but, my friend left before i could screenshot anything. :|

This case won't get anywhere without legitimate evidence.
If this happens again, be sure to take a screenshot (F5 or F8).
For now, there's nothing anyone can do for your lack of providing evidence.

well is there any way to get chat logs from toribash?
Well if there is no way of proving this or fixing this, i guess my friend "Xerin" won't be on toribash for so long anymore.