A crossbow use skills

Sometimes, you hit a cross bow bullets. But you can't get up. Tip is full.

Look carefully inventory can be found, have 4 root is full. But the cartridge is empty. In fact, crossbow can also be placed inside a root.

That is to say, for example you have brought four lightning bolt, and met a root, you pick it up. By this time you can take out a crossbow, then switch to the lightning bolt, and then you can pick up. Each arrow can pick up enough for five. The key is to pick up the time to switch to the same species.

This don't know if a BUG. The reason should be crossbows public count that arise in the