Catching darts?

NOTE: Yes, I know that it's very, VERY unlikely that someone will catch a dart you fire at them, this is more or less just a topic I want some opinions on.

So, let's say that you fire a dart at someone in a war and they, by some miracle of the gods, manage to catch it before it hits them. Since it touched their hand, does it count as a tag? Or since they stopped the dart by grabbing it, does that count as a block?

What about if the dart would have missed but they catch it? Does that change anything?

Let me know what you think about this situation.