The biggest hit of camp so far this summer was also perhaps the scariest.

Undrafted rookie cornerback Sam Brown de-cleated tight end Daniel Brown, sending trainers scampering onto the field and a couple players saying prayers.

The 6-foot-5, 243-pound Daniel Brown was coming across the field and didn't see the 6-foot-1, 180-pound defensive back. Teammates said Sam Brown didn't see the receiver until the last minute, leading to a huge collision on a high hit to both players.

Daniel Brown laid on the turf for a few minutes, but eventually got to his feet and walked off the field under his own power. Head Coach John Harbaugh said he hasn't spoken to his trainers, but Daniel Brown seemed fine.

The play came with one play left in practice. Harbaugh cut the final snap and instead used the play as an opportunity to make a point to the entire team.

They were practicing a fourth-down situation and the defense was eager to get off the field, but a flag would have given an opponent a first down.

"We don't need that kind of penalty right there," Harbaugh said. "That's where it starts, number one."

Then again, it may not have even been a penalty. One referee told Harbaugh that it was a high hit and another said it wasn't.

"Which goes to my point about reviewing those plays actually – side note," Harbaugh said with a laugh.

"We try to do the best we can to take care of one another in practice and avoid those kinds of things. … I don't think he had any intention on hitting him high."

Here are other notes from practice:

• Tight end Maxx Williams left practice early due to a non-contact injury. Harbaugh said he didn't think it was serious but wasn't sure because he hadn't talked to the trainers yet.

• Defensive tackle Timmy Jernigan returned to practice after missing a week due to a ribs injury. "I've been working hard this offseason just for this moment, so it definitely feels good to get a chance and be back on the field with the guys."

• Left tackle Ronnie Stanley (soft-tissue) remained out after Saturday's injury. Rookie fourth-round pick Alex Lewis manned the left tackle spot with the first-team offense. Wide receiver Michael Campanaro (soft-tissue) was also out for the fourth practice. Cornerback Shareece Wright got the day off.

• Running back Terrance West showed off his hands out of the backfield. Quarterback Joe Flacco zipped a pass to him with linebacker C.J. Mosley tight in coverage.

• Cornerback Jimmy Smith jumped into the punt return drill for fun. He joked with Harbaugh after fielding it cleanly.

• Tight end Benjamin Watson seems to be getting more comfortable as camp progresses. He and Flacco connected on a long touchdown behind safety Terrence Brooks. Watson also caught another pass and held on despite a big hit from cornerback Kyle Arrington.

• Rookie wide receiver/returner Keenan Reynolds continued the momentum he picked up from Saturday's practice, as he made a nice adjustment to catch a pass behind him on a deep crossing route.

• Another day, another big play from wide receiver Mike Wallace. The free-agent addition is having a standout camp and caught another perfect pass from Flacco in the corner of the end zone despite tight double coverage. Wallace was jacked up about it and spiked the ball into a fence and celebrated with a member of the grounds crew. Even the defensive coaches gave Wallace props as he went back to the huddle.

• Rookie fourth-round pass rusher Matthew Judon got an interception in coverage, showing he can do more than just come off the edge.