Who said Trayvon was "grounded"? If he was, his father's lack of immediate concern and the length of time it took him to discover his son's fate don't make sense.
Also, Trayvon would have known his father and his father's girlfriend were going out to dinner and would be out of the picture for a few hours, so no need to worry about being spotted out walking. Maybe it was just shorter to walk between the townhouses? Or maybe he only did that after noticing he was being watched.
The other odd thing, of course, is that the fight took place only 60 or 70 feet from the father's townhouse. The police report said they didn't wind up the investigation until 3:07 am. So, what would have been going at 10:30 pm? Cop cars all over? Yellow tape and criminalists on their hands and knees under floodlights? Or just a few detectives quietly interviewing witnesses? Or does the 3am refer to when they finished interrogating Zimmerman downtown, the on-site investigation having ended much earlier?
Cops initially arrived on the scene about 7:15pm. They called in the Major Crimes Unit to investigate. I doubt they finished at the scene before 11