ALLEN PARK -- The Detroit Lions were due to kick off their minicamp at 3 p.m. Tuesday afternoon, but moved it to late morning to avoid rain.

Instead, they got some extreme heat, and an unexpected visitor.

Here are some observations from the afternoon:

-- Since it has dominated the early news cycle, let's start with the intruder. As I wrote here, a man police are declining to identify crashed practice. It would be improper to say he broke in though, because he just walked through a gate that was left open for practice visitors (normally just reporters this time of year). The man was yelling about playing ball in the 1980s, and later said he created the game. He singled out Tahir Whitehead, yelling at him that he was coming for his job. It was a scary incident, because the man appeared to me to be disturbed, and a couple times brought his hands to his body as though his attack were going to become physical. But ultimately, the incident was just scary, and not dangerous. The Lions security team deserves a lot of credit for that. They did a great job immediately responding to the intruder, and corralling him away from the practice field and back down the driveway he had walked. Most players didn't even realize anything had happened until it was already over. Props to the team for that -- although my gut tells me to expect changes to security protocol in the near future.

Detroit Lions minicamp - June 13, 2017 30 Gallery: Detroit Lions minicamp - June 13, 2017

-- TJ Jones opened as the third receiver with the first-unit offense, but again, it was Kenny Golladay who made some of the biggest plays in the passing game. The third-round pick was one of the hottest names in OTAs, and he followed that up with another long TD on Tuesday. He used his big body to shield rookie corner Jamal Agnew on a deep bomb, then fully extended those long arms for a clean look at the ball. And that's the thing about Golladay -- not only is he long, at 6-foot-4, but he seems to know how to use that length to his advantage. That could be a mismatch Detroit looks to exploit this year -- especially if Golladay finds himself in more coverage against 5-foot-10 corners.

-- Agnew was beaten on that rep, but also turned in one of his biggest plays on another, corralling a deflected pass from QB Brady Kaaya for his first pick in front of reporters. He has a long way to go to beat out Quandre Diggs, who continues to rep with the first team, and D.J. Hayden for a job in the nickel. But he's also been repping as a kick and punt returner -- and there, it's easy to see that his speed is as-advertised.

-- Jared Abbrederis has done a lot to help himself at the back end of that receiver competition. On Tuesday, it was Jace Billingsley making the big statement with a long touchdown. Billingsley also worked as a return man again, while Abbrederis did not -- and remember, a job like reserve receiver often comes down to what a guy can provide on special teams.

-- Joe Dahl got the first crack at replacing Taylor Decker at left tackle, but Cornelius Lucas rotated in a bunch as well, so there's nothing to discern right now on that front. I expect that to be an ongoing competition for weeks, with nobody settling into the No. 1 job until at least the preseason. When I asked about Tony Hills before practice, Caldwell noted he liked the veteran's experience a lot, and that he could factor into the mix there as well.

-- Kerry Hyder continues to start opposite Ezekiel Ansah, but don't rule out Cornelius Washington at the position. Coaches have praised the heck out of the guy this offseason, and Washington continues to get some cracks with the first unit. He's a big man with some positional versatility, so here's betting he sees a lot of field -- if healthy -- this season.

-- T.J. Lang remains out while recovering from hip injury (something the Lions knew all about before signing him), but he did do some light running on the side, a positive indication he'll be ready to go at the start of training camp next month. Tahir Whitehead did some running too, for that matter, which is a good sign for that troublesome knee -- and Theo Riddick did some hard cutting and footwork, though his legs have never been in question. (He underwent double wrist surgery.)

-- Practice was so muggy that it felt like you could choke on the air, but that didn't stop Martha Firestone Ford from watching the action from her Mustang-themed golf cart. She turns 92 during training camp.

-- Minicamp continues Wednesday afternoon, then wraps up Thursday, at which point Detroit will break for the summer.