*(Correction based on Lal Kitab context: The verse implies they are deceptive. They throw dust in the eyes. They don't just bark, they bite silently.)*
Rahu in the 1st house makes a person a master of illusion and strategy.
Dr. Sharma warns that you should never underestimate this person. They are brilliant at "throwing dust in your eyes" ("aankhon mein dhool jhonkta")βmeaning they can easily deceive you or hide their true intentions.
Unlike Mars or Sun, who will openly declare war and shout at you, Rahu in the 1st house is a silent operator. They don't waste time barking or making empty threats; they strike silently and effectively when you least expect it.