Hold __ to recharge shield?

[ZiDyLaNiz]

I was waiting for a few friends outside the boxing room to start the ritual and I was jumping around exploring the map. Just near the outside of the ritual room there is a boat turned upside down. I was touching the rear right corner of the boat and jumped, then a pop up on my screen said "Hold (Square) to recharge shields". I Held square and nothing, that I know of, happened. The pop up was still there no matter how many times I tried to jumped and hold square. I went back to the same place my next game of zombies to see if it was still there and it wasn't, and hasn't been there since. I would've taken a picture of it if I had known I wouldn't see it again. Has anyone seen this, or know what it means?

[ChinaRepublic]

You found fuel for your Rocket Shield's rockets.

[ZiDyLaNiz]

58 minutes ago, ChinaRepublic said:

You found fuel for your Rocket Shield's rockets.

I'm an idiot