What happens when you get scared "Half to death twice"?

Getting scared half to death twice can be interpreted mathematically. On getting scared half to death first time means getting scared to death half once or 50% or 1/2 times alive.

On getting scared half to death second time implies that being scared half of the remaining life which is 1/2 of 50% or 25% (1/4 in terms of fraction).

Hence, you are scared to death by 50% + 25% = 75% or 3/4 in terms of fraction.

Getting scared twice half to death implies you are 25% or 1/4 times alive.

Well half to death twice is death