Something to note about Death's Dance.

Since it is entirely impossible for a player to die to one of their own effects (ex: can't commit suicide by casting an hp-cost ability at 1 hp), a player can't die to the bleed effect from DD. That is to say, if that Syndra R was anything less than 30% overkill , you'll live. Even without using the AD spellvamp to heal through the bleed like Rito most likely intended, it just straight up ensures they always have to land at least one more spell or attack than should actually be necessary to put you down. In my last match I got hit by something that should've killed me, bled down to 2-4 hp... and stayed there bleeding for "200" more damage. I'm pretty sure when you take 200 damage at 4 hp you die, but I guess not.