possible vlad bug
Not sure if this is a bug, but pooling actually leaves vlad open for a milisecond after he UNpools before he can cast spells. I noticed is happening in ARAM, id snowball into the enemy team, combo off, pool, and befor ei unpooled my E woudl come off CD, but as i was unpooling i coudltn cast it, and would be ebaten into a bloody pulp by the enemy team.
Its a fraction of a second, but a well timed CC effect basicaly ensures death, ESPECIALLY given that pool is his only escape tool. and costs his a failry high amoutn of HP to use.