The part I don't understand?
"...Colwell said the "brave" behaviour of the passengers and driver probably prevented anyone else from being hurt...."
He must mean this:
"...I was running up the alleyway, slapping people telling them to get going, move, get off the bus. I got pushed over, some lady got pushed over, I was just making sure everybody was OK, and we all got off the bus..."
and this
"...When we came back on the bus, it was visible at the end of the bus he was cutting the guy's head off and pretty much gutting him up," said Caton.
The attacker ran at them, Caton said, and they ran out of the bus, holding the door shut as he tried to slash at the trio..."
and this
"...While we were waiting on the side of the road, [the attacker] was taunting the police with the head in his hand," said Caton..."
They bravely ran away. What a bunch of <insert very derogatory and vulgar terms here>.
As far as fighting back? The poor guy was asleep. He woke up to find himself being stabbed repeatedly. He was basically murdered in his sleep. Kind of hard to fight back when, by the time you're awake and conscious, you've probably been stabbed several times severely, and you're dying.
If I had been there, I would have killed the guy, or died myself, trying.