: That would be really awesome level, forcing you to set up
: ambushes and patrols looking for the berzerks. Plus,
: it's actually plausible because you're bever actually
: sure you've killed the watcher in that level. There's
: this little "boom" and he dissapeares. In
: fact i think there was an unused sound in that level
: that said "Where did he go?" Hmmmm....
That boom is him exploding. Apparently, he's hollow stone with contents under pressure.
The sound you mention didn't refer to the Watcher, it referred to that Shade at the beginning. Originally, he teleported out before you could kill him all the way, then back in where the second shade is. For some reason, they went to the two-shade thing instead.