If it really bothers you contact the user that did it and ask him/her why.
Just to note
proof (such as a screenshot)
Screen shots can easily be manipulated.
Furthermore
Should WE ban him
You are breaking the rules here by calling for an alliance against a certain member.
I am curious who fooled you into believing you were negged by souleman because there are not that many members out there that can hit as hard as souleman does.

My suggestion:
Either contact JupMed or the user himself.
Maybe he wants to come out clean.