Jesus reached out to grab some taqsh from the tree but there was none, not even on the higher branches that were out of reach. This means the fig tree was barren, people would know this but they didn't get around to chopping it down or they thought they should leave it there for the shade or for some other reason.
When Jesus saw that it wasn't making taqsh baby figs, he said may you never bear fruit again to the tree. The tree instantly started to die and fall apart.
He showed everyone that we have free will but our essence doesn't, if Jesus says burst into flames, you'll burst into flames, if Jesus tells a storm to stop it stops, if he tells a fig tree to die, it dies. That's probably why demons are so afraid of him. He even told some people to come back to life after they had died.
I think that is what they were trying to tell us when they wrote that passage.