flat tire - it just blew

Out riding with K when she had a flat tire. As it turns out, there had been a low pressure warning for a while that both she and B had been ignoring.  Oops. 

Fortunately,  B came up quickly and saved us. He put on the spare and switched cars with K. He later got a good deal on two new tires - the one that blew and the one that had been about to go for a while.