Let me share a story of what happened (it was an epic moment) in one game, which prompted this question.
Our party consisted of a Shardmind Psion (myself), a Halfling Rogue, and a Dragonborn Paladin. We were tasked to check out a dungeon that was known to house goblins.
Upon entering the room, we paused for a minute at the doorway to listen for monsters. As we stood there a lone Goblin wandered in and out of the room, obviously on patrol. The Halfling and myself did a fair job of moving down the stairs quietly and hiding in the shadows. The Dragonborn in his plate mail however, was not quite so graceful. Fortunately, he was able to conceal himself behind a pillar before the Goblin re-entered the room. After glancing around for a minute, the Goblin left again.
The Halfling sneaked over to a bear rug in the center of the room and examined it closely. After he found nothing suspicious, I moved in to check it out as well. The Dragonborn began to move again, and again made plenty of noise in his plate mail. We all returned to hiding spots as the Goblin came back to check things out.
This time though, the Dragonborn was fed up with sneaking around. As the goblin entered, the Dragonborn jumped from behind his cover and roared to intimidate the creature. The Goblin of course wet his pants, and immediately turned to retreat. I quickly chastised the Dragonborn for such a move, which was sure to result in more goblins coming to the room. Then, I turned and did a Kinetic Trawl (Augment 2) to pull the goblin back into the room before he could escape.
The Kinetic Trawl did its job, and then some. The goblin was pulled back into the room, far enough that he landed right onto the bear rug - which turned out to be a pit trap! In addition to that, there was a rat swarm at the bottom of the pit that turned aggro against anything falling in. Kinetic Trawl (Augment 2) + Falling Damage + Rat Swarm Attack = Dead Goblin!
The story now having been told, should the Goblin have had a save before falling into the pit? Would that have resulted from "forced movement into hindering terrain" or "save to avoid a trap"?