As I've written: "A hypothetical jury could determine that Tyler Austin and Joe Kelly acted with intent." The second issue is whether Tyler Austin's intent was to break up a double play, to harm Brock Holt, or both.
I'll again provide links to videos of Austin's slide and a Mookie Betts slide from 2015:
https://www.youtube.com/watch?v=33uFpLiDNzQ
The slides can be distinguished by several factors:
1. to his credit Betts' spikes were not up while Austin's spikes were
2. Betts was out at second base by at least eight feet while Austin's play was much closer*
3. the target of the Betts slide was attempting a double play while Holt made no attempt at a double play*
4. despite his extended left leg, Austin's butt went directly over second while Betts' butt pretty missed the bag as he took the side where the infielder was making the relay
5. Betts was completely past the bag when he made contact with the infielder while Austin was on the bag when contact happened
6. at the points of contact Betts' left leg was higher than Austin's left leg
7. Betts' contact went for the knees of the infielder, who was knocked over (at :55), while Austin's foot made contact with Holt's moving lower leg ... or vice versa, or both (at :31).
Nevertheless, the TV announcer called the Betts slide "a good, clean, hard slide.":rolleyes:
* some have questioned whether Austin should have known that Holt would not be making a relay for a double play. After the game Boston manager Alex Cora praised third baseman Rafael Devers for eschewing the easy out at first base and instead opting for the tougher play of getting the lead runner at second base. From Austin's perspective with his back to first base, the Devers throw to second base perhaps suggested an attempted double play that deserved a hard slide.