In order for significant thermonuclear energy production, the fuel must remained confined for a sufficiently long time (at both a high enough temperature and density) so that a large number of nuclear fusion reactions will occur. For inertial confinement, this time is less than a nanosecond. For the magnetic confinement, this time ranges from seconds to an eventual goal of hours.
The strategy employed in appropriate management responses where a fire perimeter is managed by a combination of direct and indirect actions and use of natural topographic features, fuel, and weather factors.