I think it might have been one of the ducks or the goose that stepped on the chick, not the other chickens.
We also have some 2m/o turkey poults right beside the chicks and I saw one of the chicks run in there & get pecked this morning.
Unfortunately I don't really have an easy place to throw...
I have out chicken & her (former) eggs in a dog crate to keep the other chickens away from her, the eggs started hatching 2 days ago. This morning I found a dead chick, looks like he ran out between the bars of the dog kennel (he was hatched overnight so there could have been something wrong...