"Cover the Bag"

What is the definition of "cover the bag?" Well, that depends on who you ask. Braden had a tee-ball game last night that I unfortunately had to miss. So I got this story from Scott(who, of course, did not find it humorous). He says, "I got so frustrated with Braden tonight." My thought...whats new? So of course I ask why. He says "I put him behind second base, right behind the base, and I told him that when the ball is hit cover second so we can get the guy coming from first. It was perfect...the ball was hit to the shortstop and Braden runs to the bag, stands in front of it and puts his arms out to block the kid from getting to the base." I fell out laughing!!!! Scott said "Braden, what are you doing?" His response, which I thought was great was "You told me to cover the bag." I told Scott he did have a good point there.