When you're doing those operation scenes, you not only have...

When you're doing those operation scenes, you not only have to be on top of the dialogue and the rhythm of the dialogue and what's happening dramatically, but you've got to technically get the rhythm right, so that everything is fitting with the dialogue at the right time. And you're performing the operation to the audience that's watching it. Thackery has to present it, as well. In some ways, that's the most challenging.