Death by Fire?

I was doing some magic-related sims science the other day and one thing I learned about the inferniate spell is that you can actually cast it as many times as you want and create a massive house fire, but your caster sim needs to be off the active lot and do it from a distance. I assume this is a bug because sometimes I was able to walk inside the house and use all appliances as normal while everything was still in flames, sometimes not. With fire set in right spots, it was indeed a super-deadly experience QED.