The Meaning of Life, the Universe, and Everything.
I'm not sure what you're asking? What does "flying like crazy" mean and what firing animation are you referring to? I'm playing 1.13.1 and experiencing no issues with the phantom or firing animations for the bow or trident so I'm not sure what you mean. Are you using a texture pack? Might your pack be the issue?
He's probably referring to their diving attack and the fact they are under (and so catch fire when exposed to sunlight). Phantoms will increasingly target the player the longer he goes without getting into a bed (that's literally getting into it, you don't need to actually sleep the night away) and the way they attack is basically flying with an elytra and smacking into something.