Crumbling Pillar Animation

[LiberationB]

Hello Programmers!
I'm making a puzzle map and I wish to make a pillar (doesn't really matter which) crumble when interacted with.
I've gotten the bottom half to "dismantle" by using self-switches, but I cannot figure out how to make the top half seemingly invisible?

I have tried the following:
switches
self-switches
variables
conditionals
event erase

Please help!
LiberationBattle

 

[LiberationB]

OK, here is a bit of a solution:
I used a variable to set the event movement route to transparent.
Now, it will disappear when I click on it...
But I want this to happen as the result of a previous action, so I am meddling with priorities and such.
Suggestions are welcome!
[doublepost=1500066407,1500065533][/doublepost]Got it!
The bottom half has to be processed parallel to the top, which is on an autorun self-switch.

Thanks!