Peter, who had followed Jesus at a distance into the courtyard of the high priest, was sitting there among the police officers, warming himself at the blaze of the fire.
of my heart
I need warmth
even as fearsome
as an enemy’s
I’ll sit in
to abate one
I am self lonely
but only this far
so brave before
so marginalized now
a situational traitor
Having run away in order to fight another day, Peter fled just far enough to be able to turn around and see the crowd on their way back to and through the Jerusalem walls. Picking up their scent, he follows until he finds himself in the courtyard of the high priest.
Waking up at this point, Peter either needs to leave or blend in. Most translations say that Peter sat with the guards. The Greek is ὑπηρετῶν (hupēretōn, servant). This can be extended to the soldiers of a king. Whether regular servants such as a maid or guards, there is a significant question about not being noticed. Even with just a warming fire for illumination, dress and familiarity with a person are hard to fake. If the heightened energy of gathering dignitaries and an arrestee having just come through, it seems unlikely that a stranger would not be spotted.
Even if Peter pulls off this Mission Impossible, we still have the prime insider only marginally closer than all the other missing-in-action disciples. Betrayers are now all outsiders, no matter what their intentions might be. While Peter is being warmed, Jesus is facing the fire of fearful antagonists.
It is worth noting a word more about the setting of a fire from Waetjen219:
…the natural expectation is that Peter is warming himself at the fire, as, in fact, it is translated in most English versions. But the word pye (“fire”), which occurs in 9:48–49, is not used here. Instead, the narrator has chosen the noun phōs (“light”). Peter is deriving warmth from some kind of light, and the most reasonable assumption seems to be that its source is Jesus, who is inside the high priest’s palace being interrogated before the Sanhedrin.
This helps keep us in the realm of a Wisdom story, not history.