(If Mike went after Will sooner)
After the fight, Will retreated back to his safe place, Castle Byers in the woods near his house. Still soaked from the rain, he sits inside the little make-shift hide-out that's been with him since he was 9.
As it pours down outside, he sits on the cushions lying on the ground, looking through the pictures of him and the party. He feels so stupid now.. to think that the party would last forever until they die... That was the dream that kept him going that one week he was in the Upside Down. That's what kept him determined to survive that hell. And now.. he feels like an idiot to keep believing in that dream.
Mike felt terrible after the fight and decided to go after his friend. He got on his bike and peddled to Will's house through the pouring rain, determined to make things right between him and Will. He didn't mean to be a jerk. He didn't mean to make Will run off like that. He was just mad...
Mike makes it to Will's house and bangs on the front door a few times. He's not there... So Mike goes with his second option. Castle Byers. Eventually, Mike finds it. He's quite a few yards away from it when Will suddenly exits the small hideout, tearing apart what looks like photos while sobbing loudly with anger.
He has a bat with him and after he throws the ripped pieces of pictures to the ground, he starts tearing down Castle Byers. He rips off the sign and the little sheet covering the entrance, and he starts beating the thing down with the bat. He keeps repeating the word "stupid!" over, anger and pain in his tone.
Mike stood and watched for a moment in disbelief. What was Will doing? Why was he destroying the one place that Will sought refuge when things got hard, when he needed to think, when he needed space... Mike couldn't watch any longer.
"Will! Hey, stop!!" He yells, dropping his bike and dashing towards his friend, grabbing his wrists to stop the relentless beating with the bat.
"Will, stop it! You could hurt yourself-"