Yeah, 100% feed in the enclosure. There's no benefit at all to moving them outside to feed, except for potentially stressing them out and putting a young BP out of "food mode". Honestly, the other opinion is moot. Look at breeders who have a hundred or hundreds of snakes. None of them take each snake outside to feed, and everything is just fine.
I'd wait a 2 or 3 days before trying again. For a baby, it's always better to let them chill for a few days in between any activity.