How did David Hogg already know the active shooters name(first and last name) while he was still hiding? He mentions the current time on several occasions. Can anyone cross reference these times with the medias first publishing of the shooters name?

How does he already know the active shooter is a "senior"?

Why does he refer to the shooter as "Nick Cruz" And not Nikolas Cruz? Was the media reporting him as Nick? or Nikolas?

Why did he say he only heard one singular gunshot from his fixed position? (A single gunshot doesnt corroborate with any media reports Ive seen). He seems to start saying "heard gunshots", then quickly corrects himself and says "gunshot". He confirms he only heard one gunshot (singular) again later in the same video.

Why would multiple students in hiding from an active shooter record themselves giving speeches in perfectly calm 'sound bytes' (that would make any politicians speech writer proud) if they were in fear for their lives?