Re: How dare he/she...
"It was the *even* bit, as in even if they are not US residents."
Yes, because that is the time when special circumstances kick in, eg in many/most countries, temporary workers don't pay local tax or other "charges" levied against wages and are not entitled to local benefits so a person in her position and experience level should have been paying extra special attention to the details of the "compensation". Since she wasn't, then she was negligent.