If the domain is pending delete/near pending delete, that means ANY drop catching service can get the domain. ie. Pool.com, NameJet.com, SnapNames.com or any other of the 975+ domain name registrars.
IF one of these services that I stated above catches the domain when it drops and you have a back order placed, it would go In Auction on the day it was captured. This will normally be the 6th day After the domain goes into Pending Delete status.