Yes I bought it up to use as a point. In a thread started by me. If he wanted to give his opinion on the subject I was using for the point. It should have been posted on that thread.Gusd brought it up first. The other guy gave his opinion on it. That's how it goes. Their arguments fit within the parameters of the OP. Not a derailment.
There was no argument by me but his comment did not fit into the original parameters and was what I would consider a derailment attempt