JMNT(i)
17 Now the seventy [other MSS: seventy-two] returned with joy, one after another saying, "O Lord, even the demons (Hellenistic concept and term: = animistic influences) are continually being subjected to us (or: set under and arranged below for us) within and in union with Your Name!" [comment: 70 in Judaism = the non-Jewish nations – Bruce Chilton]
18 So He said to them, "I continued gazing, contemplating and repeatedly watching the adversary (opponent; enemy; or: satan) suddenly falling – as lightning from out of the sky (or: as lightning – from out of the atmosphere and heaven).
19 "So look, and realize – I have given to you folks the authority to habitually step on and trample snakes (serpents) and scorpions – as well as upon all the power and ability of the enemy (or: the hostile or adversarial person) – and nothing will proceed in any circumstance causing you folks harm (or: wronging you or treating you unjustly).