add min

code/modules/atmospheric/ZAS/Fire.dm

@@ -155,7 +155,7 @@ If it gains pressure too slowly, it may leak or just rupture instead of explodin
 		set_light(3, 1)
 
 	for(var/mob/living/L in loc)
-		L.FireBurn(firelevel, air_contents.temperature, air_contents.return_relative_density())  //Burn the mobs!
+		L.FireBurn(firelevel, air_contents.temperature, min(air_contents.return_relative_density(), 1.))  //Burn the mobs!
 
 	loc.fire_act(air_contents, air_contents.temperature, air_contents.volume)
 	for(var/atom/A in loc)

code/modules/mob/living/carbon/carbon.dm

@@ -26,7 +26,7 @@
 
 	var/pressure = environment.return_pressure()
 	var/temperature = environment.temperature
-	var/affecting_temp = (temperature - bodytemperature) * environment.return_relative_density()
+	var/affecting_temp = (temperature - bodytemperature) * min(environment.return_relative_density(), 1.)
 	var/adjusted_pressure = calculate_affecting_pressure(pressure) //Returns how much pressure actually affects the mob.
 
 	if(!on_fire)

code/modules/mob/living/carbon/human/life.dm

@@ -571,7 +571,7 @@
 		var/loc_temp = get_temperature(environment)
 
 		//Use heat transfer as proportional to the gas activity (pressure)
-		var/affecting_temp = (loc_temp - bodytemperature) * environment.return_relative_density()
+		var/affecting_temp = (loc_temp - bodytemperature) * min(environment.return_relative_density(), 1.)
 
 		//If you're on fire, you do not heat up or cool down based on surrounding gases.
 		//Or if absolute temperature difference is too small