Didn't he chase them off of the ship by activating the self destruct? Or was it the Gua'uld who did that out of spite?

Otherwise, he could've just messed with their controls/interfaces enough for them to deem the ship unusable. Completely disabling navigation or whatever. I watched Descent such a long time ago, sorry if I'm making weird claims.

Edit: wait a minute. That's why it was all scrambled! Okay, so maybe they weren't trying to "shut him up" but just remove his consciousness from the mainframe altogether since he was locking down systems? And his voice being distorted is just a side effect of that?