Plate armor isn't heavy at all. A full set of plate armor is like 20-25 kilos but it's spread out across your entire body so you barely feel it. It's a suit optimized for combat. It would be silly if it was heavy or awkward to use since you would die easily.
You think plate armor is light?
Ok, stand in it for 168 hours while I leave my game on and am away for a week
It was just a silly joke because they look like they just dropped to the ground out of energy just carrying around their armor doing nothing and they need a little rest.
I don't know what's to be blue about. There's countless rocks you can throw from high places, so entertainment and joy are always 100%
