Wonderment made a good comment about Luke 10:18 (here) that related to when Satan is ousted from heaven. I am reposting a portion of his post here so as to catalog the reference with this subject.
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***** said: "It is interesting to note that JW.Org changed the meaning of Luke 10:18." At that he said to them, ‘I began to behold Satan already fallen like lightening from heaven’ (old NWT) and ‘ ........I see Satan already fallen......from heaven.’" (new NWT). Both of these translations are wrong for the same reason and in this case the action of falling from heaven is complete not ongoing."
The ESV Study Bible comments on this verse: "It is not clear whether Jesus is speaking of a vision by which he saw something in the spiritual realm or if this simply a graphic declaration of what has been happening, but in either case Jesus indicates that Satan's authority and power over people has been decisively broken."
Although the imperfect tense used here (" I was watching Satan fall") is normally associated with the past, context has to be taken into consideration for the final rendering choice, as the ESV Committee suggested that the passage was not all that clear. Allowing the possibility of a vision here can justify the NWT translation reading. Jesus' reply that he saw Satan fall has been viewed several ways. One explanation of various given, is that Jesus may have been saying he saw the casting out of demons by the Seventy as the beginning of the ultimate defeat of Satan himself.
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Bobcat