They really like to de-contextualize.
Yelling fire in a crowded theater is free speech when there actually is a fire - though I wouldn’t even term it that way - it is more of a public service.
Yelling fire to cause panic and disruption when there is no fire is grossly negligent and could cause harm, but one is still free to do so; they just need to prove no harm was intended or face consequences of some sort.
We are living 1984 though, so I suppose the only protected speech is the doubleplusgood speech of the left.
If you yell “fire” in a crowded theater and it results in deaths and/or injuries, you will not be charged with a violation of the First Amendment.