>Express gratitude, engage conversation.
You kind of can't believe this is your life right now, but you thank the patch of dried blood for lying to a giant syringe while you hid under a bed.
You deluge the blood stain with questions for a while before you realize it is neither moving nor speaking anymore. Everything is dead silent. The two "doctors" seem to have long receded back down the hall, and maybe it's safe to do some more searching.