As they were cowering behind the guards, the bandits started charging toward the caravan. The bandits' leader led the charge and charged at the strongest guard of them all.
He knew that if the other bandits faced him, they would only be slaughtered. Sure that would give him time to kill everyone else, but a bandit group without members wasn't very useful.
The 1st Circle Aura Knight Bandits were also very aggressive while the other bandits followed their lead with a little hesitation. They weren't as strong, so they weren't confident in a proper battle.
While they started charging at the caravan, a shadow swooshed past the bandits who were in the back. They were the weakest of the lot and didn't even notice that something was happening behind them. The action in the front was distracting them.