No, it's just for decoration. However, it has been established that this is a terrain piece and not a trap. (Contrary to what it says on the Lemmings Encyclopedia
)
Medieval 2: SIR! I KID YE NOTTime: 6 minutes
Skills: 8 twisters, 5 club bashers, 5 flamethrowers, 8 fillers, 8 stompers, 10 sand pourers, 5 platformers
Good: Nice variety of skills, another level that lets you test out the cool new abilities. The "back and forth" setup is good as it reduces the need to scroll across.
Bad: Too many twisters, which means you can use these to clear most of the level and you're not forced to be creative with skill use. The wall at the end is much wider than is really necessary. (Thankfully we don't have to wait for a slow basher to get through here)