Sorry - sea anchor not anchor and even they can be good and bad, a good heave to is prefered, if you have no rudder a sea anchor is nice to have though

but they need to be set up right and you need good hard points for them.
Havig said that if/when all hell breaks loose there are cases to having what ever you can trailing out of the back of the bus, I remeber when Enza finished her first trip round they where riding out a storm and had everything they could that was viable out the back to slow them down.
Head injuries aren't good, it's best to be a bit cautious with them in general.