There are just four training camp practices left for the Packers as they wrap up preparations for Friday night's game against the Colts in Indianapolis on Wednesday and then work out next Sunday through Tuesday for the pre-season finale against the Chiefs at Lambeau on September first.    The team welcomed back several injured players, including number one pick Derek Sherrod, tight end Spencer Havner and 4th round pick Davon House.  House, the defensive back from New Mexico State, pulled his hamstring the first week of camp and hasn't been on the field since.  Mike McCarthy said he looked good and played smart, never opening up to full throttle but he's in desparate need of practice and game reps.  House said after practice he doesn't think he's too far behind and is anxious for his pre-season debut at Lucas Oil Stadium Friday night.   Two players were injured at Tuesday's workout, linebacker K.C. Asiodu hurt his shoulder and offensive lineman Sampson Genus was hobbled with a turf toe.  The highlight of camp so far took place on the final play of a team drill as offensive linemen Marshall Newhouse and Nick McDonald got involved in a scrape.  It's rare to see players from the same position group get into a fight but once they tangled, it got pretty testy.  Most of the team circled the players until they were pulled apart as offensive line coach James Campen played peacemaker.  Hit the link below for a tongue-in-cheek look at the Tuesday afternoon bout with comments from the fighters and spectators.