Thornkeep monster question *spoilers*

[Silverhand]

Hey GMs,

I'm running Thornkeep's "Enigma Vaults" pretty soon.

Here's the question:

Can a creature that cannot speak activate a spell (from a scroll) that requires a vocal component?

It's particularly relevant since the tactics section mentions the creature will go invisible first, then on its next turn, begin casting from a scroll. Since the creature can't speak it will be invisible and silent while casting. NOTE: the creature does not have "silent spell" feat.

Thoughts?

[Muser]

If you mean who I think you mean, in the original story they could emulate speech via rapid buzzing and clicking. Worked for Akerley, should work for scrolls as well.