Once in his life has Bakugo seen an angry Izuku, luckily the anger wasn't directed at him. If it wasn't for the fact that Izuku was Quirkless, he would have bet his life, that it was his Quirk. After the age of ten, he learned an important lesson: "Don't piss off the Midoriyas, or Satan himself will knock on your door," by Mitsuki. The wisest words she ever spoke.