The quietest subsonic rounds will not cycle semi auto action handguns, so you compromise on speed of follow up shots for quietness, you anticipate stovepipes and failure to ejects.
The opposite could also be possible, this was a pro who chose to manually cycle the firearm with no gloves for improved dexterity. He didn't fumble when the firearm 'malfunctioned' he cleared it and finished the target, then exfilled successfully.
Whether or not subsonic rounds will cycle in a semiauto depends on the setup and the ammo. IF he knew what he was doing. The suppressor would marginally increase back pressure and you can compensate for the lighter load charge with a lighter return spring, lighter slide, etc.
The quietest subsonic rounds will not cycle semi auto action handguns, so you compromise on speed of follow up shots for quietness, you anticipate stovepipes and failure to ejects.
The opposite could also be possible, this was a pro who chose to manually cycle the firearm with no gloves for improved dexterity. He didn't fumble when the firearm 'malfunctioned' he cleared it and finished the target, then exfilled successfully.
Whether or not subsonic rounds will cycle in a semiauto depends on the setup and the ammo. IF he knew what he was doing. The suppressor would marginally increase back pressure and you can compensate for the lighter load charge with a lighter return spring, lighter slide, etc.