"تأدى" - Translation from Arabic to English

Somebody on the outside thinks they can do our job better.
أحدهم بالخارج يظن أنه قادر على تأدى وظيفتنا افضل منا

- and then he fell and hit his head. - So?
. وبعد ذلك سقط على رأسه و تأدى - إذا ؟