Comment by sandworm101

From that footage we have absolutely no idea which pilot was flying, and certainly not what they were saying to each other.

We know they called "three green" to tower. It would be impossible to see three green with the gear up. Doing so would require a hundred one-in-a-billion things to happen all at once. So both pilots screwed up. In such a situation it is expected that the instructor/check pilot take over immediately.

Unannounced (ie surprise! Rather than a declared emergency) gear-up landings happen regularly and it always a pilot error.