EE drilling in sheet metal, bit hung up twisted hand/arm. No medical at time, later reported pain, had treatment. EE advised of strain shoulder/upper arm. EE returned, regular job duties. Follow up 3/9 added ""no operating heavy equip."" EE unable to perform the regular job duties. 7000-1 reported within 10 business days of new restrictions. Terminated on 3/14, unrelated to injury.