the reason behind the plunge may be the markets over the last year have certainly appreciated more quickly than the fundamentals , it is the big revision & may be the financial year closer may be also the reason.
I think that every dip is healthy after all, for me, i prefer to have huge dips instead of huge rises (and this is good after all)
Obviously that i enjoy having HUGE earnings, but if you have huge dips, you can easily buy as much as you can and forget for a while, and then go to buy back again and make a x2 of your money.
It is just matter of your intelligence, and how do you see those things.