'...0…'
Ronny's countdown was heard by his teammates while they were battling with their opponents. But there was a slight difference of time between when Renar and Viper heard it and when Belar heard it.
Belar heard the voice a few moments later than his teammates. As a result, he was delayed in executing what he was supposed to do. And coincidentally, he had been taken a bit further away from his allies by his opponent at the time.
But Belar didn't realize the delay. Having his senses focused on the immediate battle didn't allow him a chance to do so. He dropped the vials he was given the moment he heard the command. And that sealed his fate for him.
Ronny had given him a different set of vials than what he had given to Renar and Viper. It contained three vials of the D-Rank miasma potion he had received in the dungeon as one of his rewards. There were only two vials of the miasma potions of the same rank left with him now.