A wheelsucker is responsible for his/her own safety.
If they zap your back wheel with their front tire, they'll likely go down.
Don't let drafters phase you, unless they get obnoxious.
You can always yell 'braking' . . .
Have NEVER had a single cyclist crash into us in over 36 years of tandeming.
Now cars and/or trucks . . . well that's another topic!
Just our experience.
Pedal on!
RUdy and Kay/zonatandem