tasya-of him (Lord Siva); anudhavatah-who was following; retah-the semen; caskanda-discharged; amogha-retasah-of that person whose discharge of semen never goes in vain; susminah-mad; yuthapasya-of a male elephant; iva-just like; vasitam-to a female elephant able to conceive pregnancy; anudhavatah-following.