FOXBOROUGH -- Patriots rookie linebacker Tyrone McKenzie was not present for the Patriots' afternoon rookie mini-camp session after leaving the first practice with an injury.
McKenzie, the team's second of two third-round picks, got tangled up with a tryout running back during one-on-one drills in the morning session. He went down and was on the ground grabbing his right knee. He was able to walk off the field on his power, and after being checked out further on the sideline he watched the remainder of the first session.
Here are a few other quick observations from the second practice:
-- Darius Butler has continued to impress with his coverage skills. Butler has quick feet and is able to change direction smoothly to mirror wide receivers. He also closes quickly on receivers in front of him. Butler seemed to improve in each of the sessions over the last two days.
-- Tryout wide receiver Robert Ortiz has been impressive with his route-running and his hands. The Patriots had Ortiz in the fold last spring and summer and cut him last July to clear the way for the signing of LaMont Jordan. With third-round draft pick Brandon Tate's right knee a question mark and seventh-round pick Julian Edelman making the transition from quarterback, it would make sense for the Patriots to sign Ortiz for depth purposes. Counting Tate and Edelman, the Patriots have eight wide receivers currently under contract.