It seemed strange considering when that first girl with the campfire was attacked by the careers, after they left her without hearing the cannons they got a bit concerned that they might not have finished her off. Stating it was pointless to leave someone alive in case they have to track them down again. Maybe there was a fire or some other game incident going on in another part of the arena that distracted him into fleeing. *shrug*
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Smurf, the cream of Sonic fanboyism