Died for a mysterious reason. Is this a bug or not?

How this is possible? League of Legends
Died for no reason? Urgot with full armor build + armor runes. Bashing through the last fights, then suddenly starts losing hp and bang, Malzahar got me.
So.. Was fighting the last fights with Urgot, full armor / MR build. Our team got all drakes except the last elder which enemy team had in this fight. Suddenly i start losing lots of hp and ran away. Still keep losing hp till i died. Is this a bug or something? Sorry for the crap quality, never been uploading any videos, so i just recorded it and uploaded. This my first video in my 30 years career :/
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