His smile vanishes and his brows knot in thought. It takes effort to change, requires power to enforce it upon others. He wrinkles his nose and stares at nothing and nobody. The time for jokes is over.

"Some external influence? One strong enough to enforce change?"

The only question on his mind is how can that power be used?

"Yes, I can see why that would trouble you. But there's no point in worrying is there? Do you understand what I mean, Garrus?"

Give into the fear and you will be paralysed and unable to do anything.