Thor is lying on the stage.
His special fusion state is still active. If it is gone, he knows he will not be able to endure Sam's hits. Even though that hammer, he could still feel the impact. Not just him, the force is going through him and onto the stage.
He can feel the cracks forming beneath him.
In that state, all he can see is Sam mounted on top of him, landing one punch at a time in the most brutish way a person could imagine.
And with every punch, his lightning is intensifying. His original state disappeared and Sam is now is a partial fusion state.
However, Thor can feel a much more powerful aura inside Sam's body being riled up with every hit. He almost wanted to resign to his fate. Only his ego didn't want to give in. All of a sudden, Thor activated a secret art.
His blood started burning.