Dumai was usually unphased by visitors except for this video.
A perfect example of people behaving like idiots at the zoo. Note the tiger’s behaviour before (and even after). He’s cheek rubbing the glass (the closest he can get to the humans), which is regarded as a display of affection in felids (in addition to having the purpose of scent marking). Mother raised tigers may display this towards keepers they’re familiar with; but you’d never expect to see a mother raised tiger behave this way towards strangers/the general public.
Handraised tigers typically make ideal display animals and are a joy for their keepers to work with (Kemiri at Adelaide being a prime example); but of course the aim is to raise mother-raised cubs that are socially well adapted to interact and breed with each other.