This discussion has gone past being helpful. Kris did nothing wrong in this case. If I went out with some other capable freedivers, then I would have been comfortable going past 72 ft (my max at the time). I wanted to see 85 ft, but that's it.
I would like us to focus on what we can learn from this and maybe clarify what I did wrong. This is in no order, except the first.
1) Dive with a Buddy, one up one down at depth
Fortunately, this was a rule that I subscribe to. It was also a rule of the boat owner.
2) Don't focus on a goal, see the big picture
I got focused on the fish that were deep, a freediver should always see the big picture while diving. The fish is a small part of it. I got fooled because the visibility opened up at around 50 feet deep. I think it made me feel like I was "starting over", that the fish were "right there". The visibility fooled me on actually how far the fish was. I should have seen what was really going on.
3) Breathe up properly beforehand
After my buddy surfaced, I finned up to him (about 15 feet) to get in position. I paused, took 3 deep breaths and dove down (not hyperventilating). I should have kicked up to him and made sure I was completely relaxed.
4) Floatlines with depth
I like certain aspects of a reel, mainly the ease of dealing with a 100+ feet of line. However, in my mind, I will be diving with a floatline/float when going deeper. If I were to shoot a big fish, it would be all too easy to strip the reel of 150 feet of line. The question of losing your gun disappears.
5) Be aware of the totality of the situation before you begin
I didn't fully take into account danger of a 120 foot bottom and how I would react to it. I thought to myself, I'll just stop high in the water column. I didn't think, "what happens if I see a big fish?", "how will being tired affect me?", "am I fully hydrated?", "am I relaxed?". I wasn't considering these possibilities because I didn't analyze the full situation beforehand.
6) Dump the Weightbelt
After I shot at the grouper and missed, the gun was freespooling and letting out reel line as it was going up. I wanted to lose the belt (to be safe), but be able to pick it up. I took it off and tied it around the reel line to hopefully snag the flopper and I could just retrieve it on the surface. At the time, I thought I was gonna be fine, I didn't fully see how close to SWB I was. I should have just dumped it and brought the gun up with me.
7) Stay relaxed
When I turned for the surface, I kicked harder than I normally do to get up top. I should have just relaxed and taken longer to get up top while consuming less air. Stress and anxiety all can lead to increased air consumption.
Dive conservatively
Up to this point I was doing just that. I mistakenly shot past my max by 25 feet, which is ridiculous. I didn't realize how fast I was gliding to the bottom and how the factors I talked about earlier came together.
9) Learn from others
If you want to add something constructive, please do. I won't be offended. I will take some offense to attacks directed towards the guy who just saved my ass, though.