This. Although it may seem strange to some that wild animals being taken outside can be stressful, it certainly is for our pets. Wild BPs that haven't been caught by humans? Sure! But just like the difference between a feral and domesticated cat, pet BPs are domesticated and no longer considered fully wild. Because of this, as long as their needs are being met with proper husbandry, I don't see any need to take them outside. The only times mine go outside are around my neck or shoulders while I clean tanks on the back deck. I just don't want to risk anything happening by letting them crawl. Red Tailed Hawks are MASSIVE birds of prey, and after seeing someone in a local herp group post a pic of his Boa climbing a big tree outside, it made me shudder.
If you're going to take them outside, be very safe and cautious about raptors.