Just talk.

[AlexandraRussia]

Guys, what did you do with the criminal in the storyline?  I personally killed him, but what did he do so bad?
 And what else the guys are strange that the prison bus was not accompanied by the police, very strange, just at least one crew.
 And if accompanied by where those who accompanied.
 If the helicopter could have lost control as well as the McKenzie plane, right?  .
 What do you think ?.
 What is your opinion.

[Ducky335]

 I let the prisoner live. By the looks of the knife in his gut, I figure he was gonna die sooner or later anyway, wasn't gonna be by my hand.

[Blankshield]

It's not at all uncommon for a prison bus to only have a driver and no police escort.

[Doc Feral]

If there were the driver and maybe a policeman in the front seat of the bus, the crash may have taken both out. Or maybe they panicked and fled the same way as Astrid would do, just before the rocks narrowed it too much. Or they were just killed by the convicts and the corpses hidden.

"What did he do" apart from happily watching a lot of people burn to death, preventing them from escaping, trying to kill a woman who wanted to rescue them and wounding her in an attempt to kidnap her for unspeakable purposes? Nothing, really. I'd have probably snapped both his elbows for good measure and thrown him outside to the wolves.

[hozz1235]

Talked.