As we all know Purple Guy and two other employees died in the spring suits. But what I want to know is this: how did these spring locks get employees killed, how they were able to work in a way that the employees at Fredbear's and Freddy's found safe, and can these suits work in real life???
In the book Silver Eyes *spoiler* that at beginning when "Dave" met Carlton, "Dave" was seen having scratches, deep scars, and stitches all around his body including his neck where the spring locks malfunction started. At the end when Charlie and the gang escaped the pizzaria, before that Charlie tripped the spring locks on to "Dave" and caused him blood loss and damage to the out and inside of his body. But, we are not for sure if he is really dead, according to the 2nd book The Twisted Ones.
I'm pretty sure William IS really dead. He's technically a zombie in a rabbit suit. What am I talking about? The man bled out FAKE blood, has glossy, dead-looking eyes, and pale skin. He must've already died from his first spring lock failure, and ended up repossessing his corpse. I'm now very certain this is what "I ALWAYS COME BACK" meant!
springlocks are both safe and dangerous due to compressing animatronic parts allowing a person get in the suit without worry and dangerous due to the springlocks being sensitive to moisture and pressure