what's the meaning of the “trail session”？ So I heard ideas thrown around about a possible Caroline/Klaus interaction, and you know as to...whenever there is a potential for anything possibly romantic, there’s always kind of like a trial session, a little trial period. Because you know, you want it, they want there to be like chemistry between the characters, and you want it to flow and make sense。 here ，what's the meaning of the “trail session”？