South Tower: Exploding Projectile
A number of these objects undergo explosions. Watch the comet-like object at the far right in slow motion. It is the most easily viewed because it shows up against the blue sky.
Let's take it one frame at a time.
- Here we see it flaring.
- A fragment is ejected to the left.
- Now the fragment itself splits apart.
- Let's go back to the earlier explosion. Note that another fragment is being shot down and to the right.
- It also undergoes a secondary explosion.
These explosions may seem small, but the fact that there are explosions at all confirms the presence of explosives in the building.