Holy cow. I wonder how that happened.
After Nichols left the female deputy locked in the cell he had her belt, gun and keys. He had been watching her for over a week as to the routine and what keys went to what.
He then encountered 3 other people and locked them in yet another room and took their cell phones. Leaving that room he encountered a male deputy. He took him at gunpoint back to the room with the 3 cellphone people, handcuffed the deputy (using the deputy's handcuffs) and took his gun.
You have answered a lot of questions for us. Where can we get a complete accounting of what went on that horrible day?