UPD: here is a more clearly video of a issue:
https://youtu.be/L8kt5Mt_Uxo
1st shot at a player from a mortar at a distance of 500 meters
2nd shot at a player from a mortar at a distance of 966 meters
3rd shot at a player from a mortar at a distance of 1000 meters
projectile incoming (fall) sound will be heard only on 1st and 2nd shots, more than ~1000 meters the soundFakeFall[]={}; won't work in any longer distance to fire