ur right there fella, different folks different strokes, it isnt like there sitting on the roof or walking about in the yard, its an instant thing, touching the roof and spanking off. But at the end of the day i guess you have to know your own birds, everyones birds show different signs when there in condition. But one things for certain, those 30 secs on the roof don't teach them bad habbits, as from training and racing my old birds they trap 8/10 from the sky. However different Blokes different strokes ;D