They love that grey area that they can intepret as they so choose. That is why they don't like the Constitution because it says ' SHALL Not Infringe " Leaves no grey area, but they keep searching. There have been enough bills introduced that they all should be null and void on arrival by now as Precedent has been set.Yes, you are correct there. That was a change from the 2013 bill. They added that as long as you are in the presence of the actual owner it's excepted in this one. Just don't run to the store or go to the bathroom.
As for the house-sitter scenario, it was specified in the 2013 bill that a transfer would have taken place if a person was left with firearm for more than a week. Thus if you left a house-sitter in your place for a week and a day it was considered a 'transfer' even if they had no access to it.
In this bill no time limit is specified, meaning it'll be up to the Atty. General on how long you can leave a firearm with someone before it's considered a 'transfer'.
There is no exception though for the situation above, so unless that is built into the regulations as well that situation could be just as valid for this bill as it was back in 2013.
In fact that's one very scary thing about this bill. The reason it's so short and simple compared to the 2013 bill is because they are purposely keeping it as vague as possible.
This means that the US Atty. General will have enormous latitude in creating regulations, and can delegate that power, as is typically done, to the ATF.
You will notice there aren't even penalties specified, or even whether it's a misdemeanor charge or a felony to violate it. The Atty. General can make them up and change them at will.
In reality it's a blank check to the executive branch to do almost anything they want, and keep changing the rules at-will.