For situation B I would tend to say "potentially dangerous".
So "dangerous" would be going into a cage with a hungry tiger or driving too fast in the dark on icy roads. Potentially dangerous might be running along a cliff path. As long as you don't trip you're OK, but a stumble that would normally result merely in grazed knees could very likely result in death.
no subject
For situation B I would tend to say "potentially dangerous".
So "dangerous" would be going into a cage with a hungry tiger or driving too fast in the dark on icy roads. Potentially dangerous might be running along a cliff path. As long as you don't trip you're OK, but a stumble that would normally result merely in grazed knees could very likely result in death.