A couple days ago I saw [this post](https://www.reddit.com/r/RocketLeague/comments/1qcgfvz/) about a bug in Rumble where the player got (and used) a power-up immediately after using another one with no 10 second cooldown in between.  That reminded me of a [similar clip](https://imgur.com/RUDdAXV) that I had recorded a while back where basically the same thing happened.  I had a theory about what was happening, so I hopped on with a friend in a private 1v1 and it took me less than two minutes to recreate it.

The 10 second power-up timer starts when you spawn.  It then gives you back the power-up you had before you got demoed, but the timer keeps running in the background.  There is a brief window of time after using a power-up before the 10 second timer restarts.  If the timer that's running in the background hits zero during that window, you get a new power-up instantly.

I don't know how tight that window is, but if I was able to recreate it within 2 minutes I assume someone who experiments and practices a bit would be able to do it somewhat reliably.

[Imgur link](https://imgur.com/a/4FOoTkW) to the video with screen shots at important frames.

I was able to recreate the Rumble double power-up bug fairly easily