Given the guy does not spend a whole lot of time with it I am not surprised at all of its response to the existing owner. It takes weeks sometimes months of consistent interaction to start taming them down.. this is where the owner has failed. Its still young but a bite might make some pin prick like marks that can cause blood.. its when they hit that 2 year old growth spurt that they can start some nasty bites.
As I said.. taming iguanas is no guarantee and that goes with most reptiles.. and they cost much more to own than the largest breeds of dogs so expect that as well as respecting them as display pet only should they become little sharks. Actaully sharks might be more tame lol.. people never realize how many sharks around them.. sharks just dont care much about eating man.
If you are looking for a reptile the most tame species are bearded dragons and they are commonly available and captive bred. As they mature out they become little lap dogs.