As a general rule, we like to perform defensive functions that do not require the use of fine motor skills. When you are nervous or stressed, fine motor skills are among the first skills to leave you. However, pulling empty cartridges from a cylinder and replacing them with loaded rounds is a fine motor skill function. For this reason, revolver shooters need to spend a lot of time practicing this reload. The more you practice, the more agile you will become, even under stress.
When I am carrying a revolver, I usually wear a six-round ammo pouch on my belt and have a six-round speed strip in my pocket. Since fine motor skills are required for the tactical reload, it is very possible to drop a live round during the process. It is a waste of time to try to bend down and pick it up. It is far quicker to just go to your pouch, or speed strip for more ammunition.
Once the tactical reload is completed, the cylinder is pushed shut with the left hand and the two-hand grip is resumed on the handgun. It is important to only use enough force to push the cylinder shut. Slamming the cylinder shut may bend the crane and cause the revolver to eventually get out of time, which can cause problems with the gun.