At my kid's middle school track meet today during the 4x200 relay, as a runner was approaching an exchange zone and as the runner for the next leg started moving forward, the runner with the baton tripped and fell forward. As he is diving forward, he tosses the baton towards the next runner, who grabs it out of the air and takes off running. Baton never hits the ground, both kids stayed in their lane and they were in the exchange zone. Legal exchange?