Yes, but 1) it usually takes more than one question, rather a series of questions calling attention to the flaw/s, and 2) even if talker doesn't change course i

Yes, but 1) it usually takes more than one question, rather a series of questions calling attention to the flaw/s, and 2) even if talker doesn't change course it's likely others in the group will see what's going on and realize OP is actually the one that knows stuff, changing the group dynamic.