Beholding the Rākşasa Virādha slain by Rāma alone (Rāvana) wishing Vaidehỉ should have regarded that as a sufficient proof of his prowess.
वैदेही प्रार्थयानं तं विराधं प्रेक्ष्य राक्षसम्। हतमेकेन रामेण पर्याप्तं तन्निदर्शनम्॥