Kraft gave the opening shot as the leader of the Star Foxes.
It looked and even sounded like a simple gun shot but everyone in the team had already seen the explosive powers of a single bullet especially when they were supposed to work harder than the Commando Mages and knew the effects of it happening.
Even though they were supposed captured villains of Ress, that does not discount the fact that they were still humans. The Star Foxes still needed to work hard to reach a certain level and their motivation to come up to the top was different from the others especially when Kraft was the leader of their gang.