Imagine it is night. You are sleeping in your bed.
Suddenly, you are woken up by a loud noise.
You see a bright energy swirl in the room, a kind of portal.
How would you react if this really happened? Very likely you'll totally freak out, jump up, cower in a corner, leap out of the room, arm yourself or some other kneejerk self-defense reaction.
But now imagine out of that otherworldly thing Pinkie Pie poked her head and said: "NO TIME TO EXPLAIN! YOU HAVE TO COME WITH ME NOW!"
How would you react?
And there you see the relevance of trust!