[Gameplay] Blitzcrank Rocket Punch.
I've been seeing discussions about Blitzcrank's Rocket Punch causing some ill effects due to it's inability to be canceled, and though I understand that this is a somewhat intended feature, there's a number of cases where I feel it may be worth looking into changing it, though these may not be them, it should give you a good idea of what's going on.
Blitzcrank can knockup (And damage if it lands early enough) someone ulted by Kalista. https://www.youtube.com/watch?v=fk1-r1nIrOU
Blitzcrank can interrupt Maokais snare, both stopping him from getting to his target, and from applying the damage or effect of it. https://www.youtube.com/watch?v=WRJYmTAI0M4
Blitzcrank can Knockup a Fizz who's in his Playful/Trickster, which allows other abilities to land and do damage to him. Though Fizz does still get to finish the animation and apply the AoE damage at the end of it. https://www.youtube.com/watch?v=HimBF7UxSGE
Blitzcrank can negate the effect of Fizz going untargetable under tower, this is one that I could see causing strife in normal gameplay. https://www.youtube.com/watch?v=e8GshY0C72M
Blitzcrank can knockup Lissandra in her ultimate, though it's not very useful. https://www.youtube.com/watch?v=roQj9bJ5Lq8
Blitzcrank can knockup and damage Elise in her Repel. https://www.youtube.com/watch?v=iKHbOl7FHew
Blitzcrank can also cause some oddities with zhonyas, beyond just knockup up someone who's in it, it can lead to some strange effects overall. https://www.youtube.com/watch?v=8VifoJ69Qyo
It should be important to note that in the case of Fizz he can no longer choose where to land after being knocked up, and in the case of Elise she can no longer choose where to rappel.
You can also knockup people in zhonias, similar to Lissandras ulti.
Further testing is needed to see if this applies item on hit effects in the cases of Zhonias, Lissandra Ultimate, & other cases where damage is not applied but the standard knockup is. Honestly it can be a bit tough using replays for this, as it requires you to wait 20 minutes to finish the game instead of being able to test something quickly and then drop out.
