[vector1]

jack identified his a/c as 6jr, the tower called him premier, that is normal, if you listen you can hear the tower call another a/c a "lake", that is another type of a/c.

6jr asks if it is going to be ok, tower says yeah, 6jr says i don't think so, tower says use caution for a/c on the upwind, sounds like there was an a/c taking off ahead of 6jr but the tape doesn't go back that far. possibly 6jr was coming in a little fast and cut a really short base leg. but if that was the case it would have been safer to land then attempt a go around. also possible 6jr tried to slow too much turning final for the a/c on upwind.

just speculation, there is quite a bit more going on then appears.