Ok so the technique is thus: grab the downed possum firmly by the last full hand of tail, do not lift the possum off the ground but drag it back-wards its back legs just off the ground, whilst uttering the words 'in nomine patris et filii et spiritus sancti' The possum will try to pull forward and away from you upon hearing those words. Now bring you steel pipe 'priest' down smartly on the back of his ear with the swing aimed at the ground below his noggin. Killed countless in traps like this and plenty running free just on dusk and never been bitten