[perihelions]

I think the only thing to do at that point is contain wildfires ignited by the burning propellant. The other commenter's entirely right: it's not practical to stop a combustion reaction where the fuel and oxidizer are already mixed.

Here's a ground-level view from a similar solid-rocket failure, for some perspective:

https://www.youtube.com/watch?v=mTmb3Cqb2qw ("Delta II Launch Failure - Multiple Views - GPS IIR-1, 1997, Rocket Explosion, USAF, Canaveral LC-17")