Also..we don't know what number set that was.
That was probably his 5th or 6th set.
I have the whole video series of that shoot, and Costa and Platz just traded off doing a crazy amount of sets. It's been awhile since I've watched the tape, but I remember counting like 7-9 sets at least.
Costa bangs out 24 reps or so on his first few sets, Platz is "only" doing 15. I believe the weight is somewhere near 325+. They use the same weight (from my memory) the whole time, and would do as many reps as possible.
A few times, both Leo and Tom, pause in the middle of a set and say "I felt something pop." Then they do a rep (or two) and continue saying "it's OK."
The whole series was pretty damn entertaining to watch. Leo is a beast, though not the easiest physique on the eyes!