While inside the demon fort on his quest for Sita, he sets all the place on fire and warns Ravana about an impending attack Except if Sita is returned unharmed. तीनों लोक हाँक तें काँपै ॥२३॥ भूत पिसाच निकट नहिं आवै । Hanuman assumed Panchamukhi or 5-faced type to https://www.youtube.com/watch?v=6cAOQp6Twlc&t=7s