OOC:
Very prudent! Soft Steps is an Eyrie-based skill that makes you walk quietly, though not necessarily hidden. You rolled correctly. Taking a look at what you have there, I'd say that's a result of 18 (first die was above 3, second die was above 4, and your boost could go to any one of them since they're all fives. At easily the highest result rolled in this playtest, you've shot clear above Difficult and were just 4 away from Hard! -applause-
The first Guard you notice is standing directly by the door, with his back to it. You could easily walk out, but he would probably see you, and would DEFINITELY see Caedus. He rolled Able, so he doesn't hear you sneaking around. The second guard is moving left along the hallway, away from you. He rolled Keen, but is too far away to automatically detect you, and Keen for him is about 12 (to your result of 18), so he keeps walking away. The third and final guard you are aware of is at the far left end of the hall, looking down that way instead of this way. He must be posted up to watch the corner. He also rolled Keen, but is more than 20 feet away, so he definitely didn't hear you.