Entering a Trap Room (): If a Trap has not been Disarmed, you must Check for Danger every time you enter the room. If the Trap has been disarmed, the negative effect is ignored and you do not perform a Skill Check. After resolving the Skill Check you may continue your movement normally, no matter what the Skill Check result was.
Being in a Trap Room: If you start your turn in a Trap Room, you don't need to perform the Skill Check, and are free to move away. The Skill Check is performed only when you enter a Trap Room that has not been Disarmed.