It seems Spicer was originally planning on revealing the firing in an emailed statement, but some sort of technical issue prevented him from sending it fast enough. So he did the reasonable thing and shouted the news to reporters who happened to be hanging out outside his office at the time, then immediately retreated to his office and locked the door.
As I read in another article about this, it would be a funny TV show. Except it's not.
In real life, it's terrifying and not funny at all.
Well, I have to admit, I lol'ed at the image. Still, more terrifying than funny.