late in the first half, mcnair avoided a hit after dropping back and threw the ball downfield. after letting the ball go, he took one more step back and when the foot came down, he immediately reacted to his leg. nothing touched him and apprently he injured a calf muscle. was originally thought to be a cramp, but i guess not. was in a boot and street clothes for the second half and it was said that the boot relieved pressure on the calf. hate to see it, but i guess we will learn later in the week what the deal is.