Pepetimbo_32412323
shin needs to wake up to reality, he still thinks he is in his old world where things were resolved through conversation. I suggest that the MC creates a tsukuyumi-type illusion magic showing a villain who kills all shin friends because he stopped to talk to the enemy instead of attacking to kill right at the beginning. This way he would learn from pain that in this world if he is not quick he could end up dying or someone close to him could end up dying. Since the MC's conversation had no effect, he needs to learn through pain.