Smite does not enough dmg

Hey, while I was playing Shen in Jungle, we wanted to get Baron, and the funny thing is, I used Smite when Baron was at 792 HP. I was LVL 14, so Smite should have done 800dmg. 792-800 = -8, so he should be mine, but he survived with 4 hp. Why Riot, is there a bug in the system? or does the baron bought armor against true dmg? Best Regards, Dennis
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