confused

so its warm out today and i have air condtion on inside so i put the chicks out side to get used to the sound they will be hearing when they move outside i put there heat lamp on so to make sure they would not get two cold ( i have 3 chicks i think about 2 weeks they are gettting tail feather and 1 chick barly getting her wing feathers so so 1 week old) well my little girl was chilling out sleeping enjoying out side and one of my black and white ones was sound asleep but my other 2 wow they were pacing back and forth cheerping loudly trying to get out of cage this was after being otu for about 20 min. birds out side where chirping i had the water fall on to make things soomthing though they would really enjoy it out there but with teh 2 acting that way i brought them back in and after about 5 min all was good they all went to sleep. so any one can explain where they stressed or excited and just wanted to get out and play shold i not do this again help


I took this pic when i first put them out i did put them in the shade i did not want them to over heat