When it happened
An implied pipe, when it is very very very implied, can be a danger to those who aim to think rationally and calmly.
Generally I believe most of what I am told when it comes to pipes. I once ignored an errant column and it was to my cost. Something you definitely don't want to be errant, is a column.
And you generally don't want many things to be to your cost either.
Let's all try to make sure pipes are quite explicit, at least the big ones. Sometimes it's very difficult walking about and trying to Be with all these invisible pipes and things making things complicated.
I don't always look. And I don't have mind contact lenses yet.