I'm going to tell someone they were being shittalked about
Do you have a problem with them? Why do you want to say anything?
No, I don't have any problem with that guy.
It is good that you are being honest with them. I would want to know if someone was speaking bad about me behind my back, so I think that that is the right thing to do.
Yeah, I'm going to say it to him, he deserves to know.
That sounds good, just be sure to give some thought as to how you tell them what you overheard. Try not to throw gasoline on the fire and escalate the situation, if you can.