User Gunfox on Reddit states that all wild pets in the Veiled Stair won't add other pets. So you can basically capture or take down a lvl 21+ pet with a 3 man team of lvl 10s.
Don't know if this is a bug or intentional but I've personally tested it out and it works.
Link to original thread: http://www.reddit.com/r/wow/comments/11 ... ur_friend/

