When you play this card, you can immediately (and only once via this card) move a Viking from an action space of your choice to your Thing Square and use it again later that round.
Additionally, if you pay an amount of silver equal to the current round, you can move two Vikings instead of one from a single action space. (e.g., in round 5, this would cost you 5 silver.)
(If by this an action space becomes unoccupied, it can be used again that round.)
I am interested about the first part: can I move another player viking? I can take it to my Thing Square and use it as my own.
In the spirit of the rules I would say no and thats how we played. BUT, is there specified anywhere in the rulebook that you can't interact with another player Viking? And still, let's assume it says somewhere and i've missed it, the rulebook says that if a profession card breaks the rules then the card takes precedence.