.Dredging up approximately 385 tons of lunar dust
In addition to recording the collision
The shepherding spacecraft will fly through
The regolith plume thrown up by the collision

Shepherding spacecraft will utilize its specialized sensors
And will look for water's telltale chemical signature
Within the larger debris plume created by the centaur,
Possibly in the form of ice, hydrocarbons or hydrated materials

Those who live to the west
Will have the best opportunity because the sky will still be dark.
Those living east of the mississippi will still have the moon in the sky
But either dawn twilight

Über-time
Über-time
Über-time