These aren't sixth graders. A major league team had a baserunner (Urshela) caught hung up, dead to rights. A free out. You take that out 100 percent of the time. Larnach isn't even attempting to score with any kind of decent rundown. Hell I'd argue 6th graders should take the free out there.
The mistake was throwing to THIRD. Larnach was already standing on the bag. A mistake obviously compounded by the actual throw. But you absolutely make a throw...to 2nd, where the player on 2nd just runs Urshela back to 3rd. Tags both runners, one (Urshela) called out.