He was fearful 'to the extent that' he refused to leave his house. [=he was so fearful that he refused to leave his house]
This new tax affects everyone 'to a greater or lesser extent'. [=it affects some people more than it does other people]
He studied only 'to the extent that' was required to pass the exam. [=he studied just enough to pass the exam]
(..) And the second reason is so you can tell him, in person, everything that happened here tonight. I want him to witness the extent of my mercy by witnessing your deformed body. I want you to tell him all the information you just told me. I want him to know what I know. (..)2003 Kill Bill: Vol. 1