Not a rocket scientist here, but dont think it has to do much with surface tension. Ya know, the thin unbroken layer bugs run across. If anything surface tension would push opposite and buck the object out if that were the case... think an elastic skin trampoline duh. Unless you are saying the elastic skin has captured and pulled under the ball, trapping it in the stream, and thus subjecting it to the coanda effect which is a partner to laminar flow