First off, EBS is not an acronym that is used very often in this forum (search shows you are #15). BST is the way to go.

A former member reported having many BSTs attaching themselves to another's chrysalis. He reported no problems because of it.

I never put "about to emerge" chrysalises outside because a butterfly that has just emerged is extremely vulnerable. If you are worried about the butterfly not eating all day, I suggest giving it a piece of fruit to tide it over.

KC

Here is a link that might be useful: What are these abbreviations or unusual words I see in this forum?

Sorry, I didn't know what the acronym was for Eastern Black Swallowtails, so I just typed that to save space in the title.

I thought about it, and I didn't really see how it would be that big of an issue (them attaching themselves to another), but I just wanted to be sure.

Ok, I didn't know if they would fly around in the cage and hurt themselves... Thanks for the advice :)

Well, I think that it is super cool that you had black cats!! Did you photograph them? I have never had a black one here. I did read here recently about one cat attaching to and pupating upon another cat, and I believe that the opinion was that it isn't a problem. You do want them to be inside a protected space when they eclose, because they are most vulnerable at that time. It is not necessary for them to eat during the first 24hrs after eclosure, so don't worry about that. You do want to be sure that they have something nearby inside the container to climb back up on in case they were to fall while they are still wet. You can just release them when you get home from work or else the next morning. It's better that they be good and dry and able to fend for themselves. Congrats on your success!! :o)
Angie