Forum:Red Dragon Archfiend destroy effect

The effect of RDA says that during the end phase destroy all other monsters that did not declare an attack. Is this effect related to the first wich says that when RDA attacks a def pos monster after damage calculation destroy all defense pos monsters. So shortly, i'd like to ask that the words "this turn" at the end of the effect does refer to the first effect or is it unrelated and it simply activates during each end phase?