To the untrained ear that might not seem like much of anything, but to a pitcher that's the sound of setbacks. As pitchers we are both blessed and cursed to be able to throw only once every few days. We can't take BP everyday like hitters. We can't catch 20 bullpens a day like catchers. We only get a certain time period (usually a very slim window) to get our "work" in. On non-game days that means simply picking up a ball and playing catch. On game/bullpen/live BP days, though, you hope beyond hope that everything will stay on track until you get your throwing in. Clouds start to creep in, the normally warm florida wind grabs a chill, and you know that your time is running out. There's a whole line of pitchers ahead of you who get to throw before you. Their palms aren't sweating, why would they be? They're going to be fine. But not you...you take the mound as the first drop of rain settles on the brim of your cap. Telling yourself it's nothing, you shake it off and continue your warm-up throws. The misty precipitation turns into beads, which turns into drops, which turns into sheets of rain. You scramble back to the clubhouse with the rest of the camp thinking "Damn, almost made it." In reality, you got bumped. You threw just enough not to be ready to go again tomorrow, but not enough to go on your regularly scheduled rest.
One time isn't that bad, you get back on your rotation after a week or so. But, if like so many of us, it happens multiple times during ST, you could conceivably lose an entire outing. You could've gotten pushed back so many times that you actually get a week behind. Which means one or two less outings than the next guy. In a world where we "work" only once every five days, losing an outing is miserable...not a death wish, but disheartening for sure.
On a bright note, I'm throwing tomorrow and it looks like 0% chance of rain. Funny how that happens. Thanks God!