I hated that in my first campaign, had pretty much most of my party silenced and teleported alone. But in my second campaign we saw them all in advance, cast slow on them all, and they only managed to get into a couple of garotting positions and teleported one person away to where I could reach them in a single move
Nice! I always anticipate them now, but yeah the first time was terrible. It was a legitimately scary fight in the game for me though, which isn't a bad thing.