Oof, don't love that. The Leaf had his leg extended and didn't even make an attempt to move laterally to get the body. I wouldn't say it was malicious per se, but it does kind of speak to a lack of respect for other players and how dangerous the game can be.
And historically, that's another one of the dangers of preseason- lots of marginal guys actively trying to do damage to the other team's guys so coaches notice them. Much less of an issue than it used to be, but there's always a few.