Originally or after he changed his statement? Originally it was the guy on the ground, then it was "Trayvon Martin" - I assume he was coached to say this, given he doesn't say whether the person was above or below.
Austin Brown only saw one person, not two people. The person he saw was laying on the ground crying out for help. He said he thought the guy's shirt was red, but after his mother got involved, she said Serino had put words in his mouth. It doesn't sound like Serino put words in his mouth listening to his interview
. Serino asks him what the guy was wearing and he says a red shirt.
Austin also says he only got to look for a few seconds. He thought the guy may have fallen and broken his leg. Serino quits questioning him so abruptedly it seems like he doesn't believe him or thinks it's not worth the effort.