A defensive maneuver in which one or more linebackers or defensive backs, who normally remain behind the line of scrimmage, instead charge into the opponent's backfield. However, in the 3-4 defense, one linebacker typically rushes the passer with the three down linemen.
Blisters are commonly caused by friction from tight shoes, herpes, chicken pox, poison ivy and allergic reactions. More uncommon are disorders that only cause blisters on the hands and feet. See your doctor for an accurate diagnosis if you have blisters on your hands and feet, particularly from an unknown cause.
Some of the possible common medical causes of Involuntary twitches in the hands may include: 1  Excessive caffeine intake or other caffeinated drink. 2  Excessive alcohol consumption, alcoholism, or alcohol withdrawal. 3  Stress. 4  Anxiety. 5  Fatigue. 6  Benign essential tremor. 7  Thyrotoxicosis. 8  Carbon dioxide narcosis.