When highlighting a piece of text in a task description, it is possible to create a subtask based on that description:
However if someone is @mentioned in the text, it is not possible to create a task:
It would be very useful in cases where there is a person @mentioned in the text, that a task would be created, which is automatically assigned to the @mentioned person. In cases where there is more than one person @mentioned, the task could create with all the @mentioned people as Collaborators.