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UpdatedJun 14, 2013 3:11 PM ET

Mario Williams is back-tracking on attributing "kill" as a word Buffalo Bills coordinator Mike Pettine has used in describing defensive philosophy with his players.

In a series of messages the defensive end posted on his Twitter account Friday afternoon, Williams clarified that he wasn't quoting Pettine directly.

"Just to clarify a choice of words I used: The phrase `kill them' has never been said by Coach Pet or any of my coaches/teammates," Williams wrote. "I said it as a figure of speech from my `perspective' not literally or any actual intention."

Williams' posts came a day after he raised eyebrows in describing Pettine's aggressive approach to defense.

"He usually says `Kill them or hurt them," Williams said, Thursday, following the final practice of the team's three-day mandatory minicamp.

Williams then smiled and added: "That's what I always hear, kill them or hurt them. So either way it's not a good thing for the other person."

The Bills took exception to Williams' comments.

At about the same time Williams posted his clarification, the Bills issued a statement from coach Doug Marrone denying that Pettine every used the word "kill."

See more here:
Bills deny DC Pettine used term 'kill'