[Don't panic! Just describe in two words what the shape of that vapour is] all this time, she held the Bullet of William in her hands. The latter heard everything that happened between the two siblings, and he didn't feel any surprise at all.
He already saw through the fake act of Richard, yet Lara didn't. William always felt from her words that she never placed Richard in her eyes, always considering all this as the grand scheme of the evil elder.
"Black… Snake…" she muttered these two words with much difficulty. She could already feel power fading away, failing her in speaking normally at this moment.
She tried to stand up from this hit, yet she couldn't. For a reason, that vapour worked like magic, instantly weakening her. All she could do now was to slightly move her arms, raise and lower them. And she felt she wouldn't be able to say another word soon.