Use Comments and Chat
You could leave a comment challenging the VTC. This way, both OP and the community are aware of the pending VTC and your concerns about it. OP may react to reflect on their question, or person that voted could explain their reasons. Any discussion should then be taken to chat.
Some interesting links:
Frequently Posted Comments (you ...
Nobody needs to be "trained".
The way that Stack Exchange works is through evolving consensus. Members do not have to share One True Understanding to participate in moderation activity; we are informed by precedent, but not bound by it.
Edit "borderline" posts
If you find a question that has a poor description but could easily be rescued,...