For example, if you are handling an angry specimen of one of the imported indonesian island forms of BTS (Tanimbars, Kei Islands, or T. gigas gigas from Ambon or Ceram) and it bites you in protest, it is almost sure to lock on, and do some tissue damage.
You will bleed (a lot). This is true of any BTS that bites you out of self defense or out of protest. Accidental bites are a whole different thing, and rarely result in breakage of the skin. They are almost funny when they happen. I have had BTS bite my hand or fingers if they happened to smell like food. It is usually a chomp with some preasure, and them just before you can say ouch, the skink releases the hand with a look of confusion on his face. I have also had accidental bites during the breeding season when one male smells another male on your hand. It is starteling when it happens, because it is so out of character, and it is a bit more violent than when they mistake you for food. They grab you, and give you a hard shake, and as soon as they realize that you are not another male skink, they let go, and it is over as quick as it started. In the last 10 years, I have had 4 accidental bites and one bite out of aggression. However I have also seen two other victems of agression bites, and they are definetly to be avioded.