Sort-of memes that are cracking you up at the moment

Zigzag plus T minus one line.

(You also don't ge three blocks like the green on the left)

how did the orange set happen in the centre?

A row may have recently completely directly above that line, clipping the upper square from that green block on the left. SO, no you don't 'get' blocks like that but this is mid-game, at what looks like a crucial juncture and is therefore an entirely plausible Tetris scenario. (quite an intense piece to put in a stair well)

I guess you wouldn't have experience of that if your ability confined you to the lower levels. So don't sweat it yeh. Both of you just relax in the knowledge that some people really know their stuff, yeh?