The throat cutting was a jolt, but I think it was useful as a reminder of two things:
1) This isn't a kid's cartoon with kid's cartoon rules.
2) The Terror is actually evil, not just an eccentric goofball like many of his previous scenes indicated.
That was especially important to the climax, to at least make it plausible that he might kill someone we like.
The Tick is definitely more comedic than Angel, but they're also definitely mixing together a lot of...