Looks like first having a magazine, preferably a loaded one, would be a good addition. Looks like they are walking on a range though. So just checking targets?
I used my FHF rig with a chest rig under it all of elk season in 2022. I practiced using my non firing hand to pull the FHF over slightly while drawing. Ended up being a super easy and fast transition. I timed myself drawing, aiming , firing and successfully hitting accurately at 20yds in under 2 seconds regularly. I carry with slide CLOSED and round in chamber. OF course, i knew you were joking. Seems idiots in charge of FHF marketing.
On a side note: my FHF rig is Nothing like the one in the pic. I wouldnt use one made like that one.