Now that you can see Griimbling's role, you can see a main part of his personality. Taking that in consideration, he had spotted you on
several different occasions traveling and hunting with Straklaw and other known defilers. We will use you hunting with Straklaw for and example first. Griimbling saw this as a way of you helping to preserve the Straklaw's existance, helping him to grow stronger and
gain in power. Further more by doing so willfully admitted he had a right to continue on existing. The fact your clothes were looted, not by Griimbling but other warders, didn't matter squat to Griimbling.
You stood at the ranger believing you wanted a appology for your death and the clothes being taken, but were dead to hear the reasoning by it. Your main excuse was....But..But Sassmi gave me permission to travel with the orc, as long as I didnt hunt any warders. What in the hell? Am I moron? A previous Captain basically told you it was alright to help an orc gain in strength, which as a sidenote was one of many reasons Griim thought Sassmi was too soft.
My reply to you, Do I look like Sassmi? I think not...So to further twist the dagger so to speak, you go out and set the forest ablaze outside by the ranger in spite. That was the last straw in Griim's eyes, as it was basically a gesture of you spitting in his face.

I hope this helps to better explain it one and for all..
And next time if you go that route which you did..
Do take in consideration the barage of tells your relaying to another player and when starts crossing the line of RP and utter and complete spam...Give it a rest for bit...

Dan