Initially, with the amount of birds missing, I assumed it was down to clashing.Now, I think it is a combination of things. The Wetherby, Wakefield, Selby etc area is reknowned for peregrine attacks ( remember the OB Wakefield, lots of birds injured,I myself had 5 return hawked ) With this in mind, I think maybe after getting struck by BOP the convoy has split into groups, heading in all directions. Clashing could have took part thereafter and this would account for alot of things.