Something burning (-om-, mag-) blazes, bursts into flames onto something (-an).
Gomilgilāyab sinosohan ko a tamek.
The grass that I set fire to burst into flames.
Maggilāyab bahay ni āpong, ta nasosohan.
Grandparent's house burst into flames, because it was on fire.
Gilāyaban dana no sinosohan kwaw a tamek iyaw bahay kwaw.
The weeds that I set on fire burst into flames onto my house.