I was on a class 150 a few years ago sat behind a couple of scrotes who I am guessing had just picked up discarded tickets off the floor, as the guard was asking them questions such as where did they buy them, when did they buy them, how did they pay for them, why they had already been "biro'd" etc. all which they appeared unable to answer!
He said he would put them off the train at the next station, so when we arrived and he went to do the doors, he announced he had called the BTP and the train wasn't going anywhere until they arrived to offload these two guys; then the guard tipped the driver to switch off the engines, and went and stood on the platform.
Without the engine noise, it all went eerily quiet, and I guess the unspoken hostility and glares of all the other fare paying passengers who were being delayed, eventually got to the two miscreants who went onto the platform to remonstrate with the guard.
He nimbly shut the doors, the engines started and off we went!
I gathered later the two were "well known" for this sort of evasion, but even so, I thought the guard handled the situation excellently! There was definitely no agression or "manhandling".
I do worry what might happen to RJ if a "Big Man" passenger decided to intervene on behalf of the guard.