Just as Mareecha is about to die, in a moment of brilliant trickery, he mimics Rama and shouts, “Alas Sita! Alas Lakshmana!”
स प्राप्त कालम् अज्ञाय चकार च ततः स्वरम् | सदृशम् राघवस्य एव हा सीते लक्ष्मण इति च || ३-४४-१९
This worries Rama as he wonders what Sita will think of it.
हा सीते लक्ष्मण इति एवम् आक्रुश्य तु महा स्वनम् | ममार राक्षसः सो अयम् श्रुत्वा सीता कथम् भवेत् || ३-४४-२४
But couldn’t Rama himself shout words to reassure Sita and Lakshmana and explain the situation? Or did Mareecha canonically have the ability to shout very loudly?