Here's what happened:
Dude is gathering light for the anima;
he has 2 weapons in the armory for the job, one is the relic one is a legit one;
the gears are saved with the anima because he's never on the job just in q for stuff while doing other stuff on another class (most likely leveling);
to take 2 birds with 1 stone he ques for both anima stuff and WT stuff;
Que pops, he's in a fate or in combat and needs to run out of aggro;
Timer is about to run out when he's finally out of combat and he accepts;
He's now in and can't switch weapon.
Been there, done that.
If we could change weapon inside a duty while not switching class that would never happen.