I concur with BOAC.
Stop the plane then work out the next move. While I've got the photos of the BT 737 moving down the runway with the reverser deployed, I can not confirm if the deployment occurred before he got the fire bell and just to add some haze to this, I'm not 100% sure he got a fire bell.
(I'm sure others will chime in here)
You see the first thing that happened was the cowl was blown away by the explosion of the engine cases, so that kind of defeats normal detection means.
And the extra heat being released was certainly streaming behind the engine until he did stop.