That's why he said leaves and not bags. It's ok to reuse the leaves, most of the times the resulting brew will be different from the previous, which is sometimes the desired thing.
You're supposed to let the first brew fill the smelling cup[0], and drink the second brew, but I drink both
[0] http://the-chinese-tea-company.com/teaware/tea-cups/blue-bat... on how the smelling cup looks like