PANIC editing

As I was editing the music video, I layered two clips one on top of another and wnet to disable one clip to watch the original to understand which parts to blade off and use the other clip in them spaces...

BUT

the macs are very old so as I clicked to fast, I clicked another option by accident, and all the clips disappeared and only the clip i went to disable was there and it was placed over the song.

My heart dropped, I thought ALL our hard work had gone, but thank fully I asked my teacher and she simply pressed the reel and it was all there.