This is a very shady area in SE (aka: This varies form case to case, as Mr.Warzecha mentioned)
Just as expected, a lot of discussion has been made network-wide on this:
Is there consensus among mods about flagging too short answers?
Should I flag answers consisting only of "No" or "Yes"?
Should I give short answers or comments?
etc etc. I think with a simple search in meta.SE, you'll find much more to read.
So, what I'd do when facing a short answer:
These answers are usually followed by a comment telling their poster of why they're VLQ. The reason for guideline 7 is that anything in your logic which is VLQ deserves a recommend deletion from you, if you're sure what you're doing.
This is the beauty of SE. Nothing of such kind is single-handedly voted on. Closing needs 4 more people to agree with you, and VLQ reviews need more than 2 other people to agree with you to get something deleted. (Unless you're a mod, but that itself means you're wiser than just to put a vote there)
Conclusion: Don't chip in if you're unsure about what to do. Following the crowd is the best choice here. If you are sure, then comment and recommend deletion, or leave it as is. If something is flagged as VLQ, put yourself in the shoes of who/what that flagged it, and add as many constructive comments as possible. The vote you cast will usually be agreed upon if you have solid arguments to support it, and even if it isn't, the final result won't be a real harm to the community.
And since the main goal here, after learning and practicing and learning chemistry, is to have a clean Q & A, then I'd say let's drink some coffee and leave our fingernails alone.