Feud has percolated along since the Daytona 500, with Tony Stewart jumping in, too.
Driver suffered compression fracture in his lower back in a crash Sunday.
Driver heads home for further tests on spinal compression fracture he suffered in crash Sunday.
Driver was injured when his car was nudged by Joey Logano on last lap Sunday.
Hamlin reportedly is alert and awake after last lap crash sparks a fight.
Driver says he was just expressing an opinion the new Gen-6 car.