I had a dance like this on Saturday night. She was one of those people who give a little extra "tug" on your arm at the end of every step-back. No reason for it, she just did it. She wasn't a beginner by any means - and she didn't seem excessively nervous either.

After 30 seconds of this, it was getting on my nerves (it doesn't take much), and so I decided to try to fix it, by leading a finger-tip hold.

Unfortunately, she responded to this by gripping the fingertip with her entire fist! - there wasn't much I could do about that, apart from gently prise my finger away and lead other things... A case where the cure was worse than the disease, in fact.