Trash talking and hard feelings between the Dolphins' Ifeatu Melifonwu and Detroit's Jameson Williams led to a post-practice incident Aug. 13.

▶ The Lions dominated the first day of joint practices against the Dolphins, full stop. The offense dominated; the defense dominated; even punter Jack Fox put a ball out of bounds at the 2-yard line. It was a bloodbath. The first teams took a majority of reps, since joint practices are in some way a substitute for playing in preseason.

The Vikings and Patriots just held their first of two joint training camp practices on a beautiful afternoon at TCO Performance Center. Fans packed the stands to watch as the Vikings got an opportunity to test themselves against a different opponent in a practice setting after weeks of battling each other.

Vikings defensive coordinator Brian Flores brought the heat at practice, challenging rookie offensive linemen Will Campbell and Jared Wilson.

Here are my takeaways from Day 1 of joint practice in Philadelphia, which was hot, physical, and saw both teams playing extremely hard.