As an ex-firefighter, I know that once firecrews are onscene, someone untrained running back into the building is seriously bad news. They split our efforts and focus of rescuing whoever is still inside. That said, to taser someone is WAY out of line, and excessive! And prior to a crew arriving, many lives have been saved by someone returning inside - though a huge number have also been lost. Problem is that while my brain says one thing, my heart says another. Personally, I would want the freedom to make a rational attempt at a rescue. Regardless, I would just love to slap that cop with the taser.
