Ajax, this is likely imagery which alludes to something else; however an alternate explanation I've heard is that it is Mark telling his own story firsthand, adding in a personal detail. I prefer the former explanation, because there seems to be almost nothing in the NT that does not allude to something else. It is like a web of allusions to other things, ideas, figures of speech. Everything seems to link to something else.
What might it allude to? First of all it reminds me of those NT passages about being tested as with fire, probably because of Colossians 3:15 "If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire."
Secondly the young man loses his robe in the scuffle, which is not Ok and which may be the point of the passage. In the law of Moses it is very bad to take a poor man's cloak and not return it (Exodus 22:26). Therefore in this story the priests servants wrong Mark and are made guilty (figuratively) by taking the robe of a poor man. Obviously they have not actually taken a poor man's robe as surety for a loan, but the imagery seems related. Most likely this story is not so much about these priests and about this young man as it is about a political situation, and the story is speaking to that political situation. What is going on in 1st century? What decisions are the Jewish people having to make, and what does Mark want them to decide? In this case it probably is an accusation that the poor are not being treated well. Which poor people? It is the poor gentiles who are kept out of the synogogue and not allowed to etc etc. Its probably about catholicism.