I have the following sentence:
There were several dominoes—some so precariously placed that I'd swear should have toppled over.
I believe it's correct, but when read quickly or out loud, it sounds kind of funny, almost like a "they" is missing.
There were several dominoes—some so precariously placed that I'd swear they should have toppled over.
My reason for thinking that the first sentence is the correct one is that if I strip the sentence to its essentials, the "they" definitely doesn't fit.
There were dominoes that I'd swear should have toppled.
Am I right in thinking that "they" is not required, or is there something incorrect happening here?