As soon as it was done, he started to regret it, thinking about the many sorrows he had to face after he met 'Stan' back then. The many changes he thought about his personality were nothing near real, he always had the same, terrible personality. Ever since he was a child, he had never been interested in something else than his herd.
Not seeing further than his peaceful but harsh life, his days revolved around boredom and survival. Now that he took the risk to tell his friends his condition, he jumped to rescue Laurel and disregarded the consequences of his last action when he saw the regeneration starting.
Slowly, blood stopped to flow and every part of his friend's face regrown. He wouldn't let another cannonball ruin it all so he carried Laurel away from the battlefield.