You were a member of the future foundation, the building was under attack and another killing game had started due to Monokuma. Sakakura was protective over Munakata, he used to be the former ultimate boxer so he could easily protect Munakata if he wished to

Sakakura: What is this shit?!

points to the forbidden action bracelet

Munakata: I believe it is a forbidden action, if we do it we will die, but hope is not lost. We must not let despair win.