Leonidas was a Psyker, and what he just did, was because he's a Psyker. It's called Maelleus Hammerhead, this makes his hands have the power to crush Adamantium and punch holes through Dreadnaughts. He ripped the arm off without trouble and impaled your shoulder. Even if he didn't rip it off and you attempted jamming your Bolter into his neck, his Errant Armor was made SPECIFICALLY to prevent that from happening with an Adamantium neck guard. No.
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Well I didn't know that so rip. But can you like, at least kill him? I wanted to have him killed off.
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The more you know. Anyway, Leonidas wouldn't be himself if he killed an Astartes without good reason. I mean, you were just doing your job. So, I'll just leave you there. But you could like, commit seppuku or get killed by a Daemon.
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Nah, I guess I'll drag my ass back to the General Quarters and hopefully get patched up or some shit.
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Alright. Just take this battle as a warning not to -blam!- with Leo. He's as good as a Psyker as he is a warrior. [spoiler]end[/spoiler]