REAS' Mecha collided with the laser barricade around the ring. If this was a Mecha battle that happened in reality, the Mecha would have already suffered from electrocution from the laser barricade. But since this was inside the VirtualNet, the health gauge of his Mecha only decreased. Like a situation in a game.
In fact, with how his Mecha had been repeatedly trounced since the start of battle, he, the pilot, would have already been sent to the hospital if this was a real-life battle. But Reas didn't feel any pain at all. This was not only because they were inside VirtualNet, but because the pain setting of his avatar was set to zero.
This was not Reas' usual avatar setting. As an aspiring soldier, training in the virtual world using that kind of setting wouldn't help him at all. It would only give the illusion that he was invulnerable to pain, which would then lower his guard and make him reckless. Traits that a soldier should never have.