The 3rd house is the house of extreme courage, valor, and physical strength. Rahu is the planet of fearlessness, rule-breaking, and sudden action.
When Rahu sits in the 3rd house, it creates an absolute warrior. Dr. Rishi Rohit Sharma explains that this person has zero fear. You can put them in the most dangerous situation ("karde khada jahan marzi"), and they will never take a step back ("paon na peeche karta").
Because of their fearless, adventurous nature, they rarely stay at home. They are always out fighting battles, traveling, or taking risks. Lal Kitab states that such people usually pass away while traveling or fighting outside their home ("ghar se bahar hi marta hai"), living life on the edge until the very end.