It depends. For example, let's say you think this copper smell is some sort of toxin I'm dispelling into the air. But I've only said it's a copper smell, and your character is the only one to have noticed the stench as being threatening so you either move away from it or cause a wind storm to blow the smell away but the others didn't. You would be safe for being aware of it and not wanting anything to be touching you.
You guys are also on the assumption that I will make a bomb with one prep. If a bomb was my intent to kill you all, I would need to prep much more. Provide many more hints as I go. This is just an initial prep.