I worked at a semiconductor equipment manufacturer, and the silane gas delivery systems had to have separate flame detectors (from the normal one's we used) in the gas boxes for cutting off the gas supply because of this risk. We also had special strobe lights in the building with a sign below them indicating "Silane Pad on Fire if flashing", to let us know the gas bottle out behind the building (gas was piped in) was likely burning, since you wouldn't know from looking out the door / window unless you got close enough to feel the heat!
Luckily, I never experienced a silane fire, but for a point, I did design and implement the safety system for an experimental ion implant system, which used silane along with other nasty process gases containing arsenic, boron and other dopants. Cool job, but the stress of "make sure you get this right" was a lot higher than other software jobs I've had, haha!
Silane is even more delightful than that- a toxic irritant that turns to sand on contact with water. So silane gas that touches your eyes or gets into your lungs will deposit on your mucous membranes as fine glass. Blindness is a likely outcome of sufficient exposure, and if there is a really huge amount you can suffocate on blood and glass shards.