I think it is very easy to attack an elder on too wide a subject, I have done it many a time.
It’s very easy to allow a subject to go from one to another, this can happen when you have got the elder on the run.
What I found was to make them answer the point in question (not easily done when they are wrong) before attacking the next, then reminding them what they have just said before carrying on.
As been said many a time, little will come out of it.
Saying;
Never argue with a fool, he will drag you down to his level, then beet you with experience!!
KT