LCS CLG v. APX Game 3 Jarvan and Morgana Binding interaction Bug

The bug is visible at around 2 hours and 12 minutes into the stream, although I believe I noticed it a few times. To the best of my knowledge once a root has been applied movement abilities can not be used until after the root has elapsed. However, Jarvan is clearly seen using his Flag combo to engage onto Morgana AFTER the binding has already hit. The animation for his Q only begins after the Morgana Dark Binding has already hit him. I have had similar bugs in games I have played, where if the cast time is close enough to the root time the movement will still go through. There seems to be some inconsistency though in how these kinds of situations are handled by the game code. Some dashes / movement abilities, if you are hit with a stun or root during the animation, will be interrupted and you will remain in the location you were in when the CC was applied (this is visible 20-30 seconds earlier in the same stream. A Twisted Fate gold card stops Vladimir's Hextech Protobelt dash mid animation). If this is the case, then even if Jarvan used his EQ combo at the same moment as the Morgana binding, he should have ended up somewhere between the start and end point of that dash, and not in melee range of Morgana. Hoping to have someone clarify if this is in fact a bug or if it is intended that movement abilities cast close to the time of a root will still go through, and why different "dash" abilities interact so differently with cc.