a close call
It would be best to leave things at this point as it seems they are not interested in talking to you. Let them be and move on.
a polymath
Chemist
customer
Arch
Hollandophile or nederlandophile
Crazy.
Oh yes it is. Goodness, call someone right now. You could be charged with all sorts of things the least of them kidnapping.
A person who does things for others may be an assistant or a helper.
The products are on the right side of an equation.
adventurous