Muffled
Jesus in me
the events before this are also mentioned by Jesus a few verses earlier in Matthew 24:4  In answer Jesus said to them: Look out that nobody misleads you, 5 for many will come on the basis of my name, saying, I am the Christ, and will mislead many. 6 You are going to hear of wars and reports of wars. See that you are not alarmed, for these things must take place, but the end is not yet. 7 For nation will rise against nation and kingdom against kingdom, and there will be food shortages and earthquakes in one place after another. 8 All these things are a beginning of pangs of distress.
The events describing the sun being darkened and moon not giving its light are mentioned later in Vs 29... so those events come later and are still future.
The Watchtower views it as still future:
The first part which is considered past did not include the coming of Jesus so even if one could ascertain that those things happened in 1914 and I don't believe that is anything more than specualtion, it still does not mean that Jesus came at that time.
I believe the watch tower is written by menwho ought to know thier Bible better since Jesus does not come when the moon is dark but his sign comes.