Yes, they do...but it doesn't matter. As soon as the grenades reach them, the combination of Reeth's and Galiss's powers guiding them, they go off, killing them all and wounding two. Quor's HK droid finishes the two off with a few quick rounds.
While you finished these men off quickly, no doubt that the grenades' explosions were heard.
"We must move, and quickly," says Tyr. "Look, we'll go through that cave up there..." He points to a medium sized hole in the wall, about 50 feet up. There are good sized ledges jutting out of the rock wall, and you can all jump up to it.
Once there, you can see that three more security men have walked out of the building to check the explosion. They see nothing, but Quor's HK droid cannot jump after you. He blows the three away from the shadows.
"Go ahead, Master," the droid says to you, Quor. "I will hold off any threats here."
"Yes, Legion," the droid replies as you head upwards.
The cave you arrive in is average size, and you can all fit. The small walk leads to a large crater, which you are near the rim of. At the base of the crater, though, is a circular construct, probably a way to access different parts of the prison. In the center is a landing pad that towers above it all, about equal with you. It is the landing bay you saw before you landed, where the prison ship was headed. The ship is there, about to take off, you think. There are people walking on the platform towards what seems to be the control tower, and another group standing around with you can tell are prisoners.
"Not our quarry," Sol-leks says, observing the going-ons through a pair of electrobinculars. "A Trandoshan, two Rodians, and a Squib. Let's move on..." He starts sliding down the gentle slope of the rock wall beneath you, towards the platform.