Zarlak
my face causes global warming
Thanks. Makes some sense.
Feck off jveezy!
Essentially, look for the yellow lines. They have to get the ball past that. They get 4 chances to do it, as soon as they do it it resets and they start again with the yellow line moving further up the field. If they fail after 3, they will smash it up the other end so the other team starts further back and has further to run.
They will either run it there, and possibly get tackled, and start the 'getting it to the yellow line' from that point, or the quarter back will throw it to someone who will either catch it, or the pass will get intercepted and the other team will have posession.