@Equilibrium - We already saw that. Author glosses over it but Rimuru had already done his mourning, he was there for almost a full day among the dead. I'm sure all of them have as we come to the city after all the dead had been gathered. Author skips this and I'm glad for it; because it would have made the "let's resurrect them all" extra-extra cheap. Now we get to the "we got shit to do" point of the story and the author again, is laying it on thick. The sword-sensei definitely made it personal and even though he's supposed to be the calm and composed instructor he made his feelings well-known. No spoilers here, but he sure as hell is out for blood. All of them are.