Given a running total of haste buffs so far, combine the next buff's haste with the existing haste and return the result. The result can then be plugged back into this function for the next buff, and so on.
Given a running total of haste buffs so far, combine the next buff's haste with the existing haste and return the result. The result can then be plugged back into this function for the next buff, and so on.