[Gameplay] J4 Dash follows through even while "grounded"
While playing Cassiopeia midlane, I laned a J4 (who was quite clearly better than me seeing my match history). Regardless, though, his interaction with my W poison did not make sense. J4 was able to use his Q as expected, but I did not expect that it would successfully pull him to his standard. This seems like it is or should be a bug. I assume this interaction is because the Q on its own should be able to cast, and is not on its own a dash.
Sorry if my post format is incorrect or if I'm missing details, first attempt at a report. First incident was in a game at ~9pm Central 6/1/2015 at the 8minute mark, if I recall correctly.
Thanks for feedback as to both why this is/isn't a bug and feedback as to how to make my reports better.