Thank you for the reply.

While that indeed would not be an unreasonable interpretation and it probably will end up with this.

Yet I'd say that Assassin strike spesifically says "After making a melee attack" without specifying any other condition to trigger.Since Whirlwind is a sequence of separate "Standard attacks" (normally a single attack action towards one target, it would also not be unresonable to be allowed to make the move after any of them.

I suppose the main question here is if one is allowed in "insert" a Free action into the middle of a Half Action happening. One could of course make this argument that during the sequence of standard attacks, it would also not be unreasonable to make a "leap up" free action, changing your weapon(s) with quickdraw free action or screaming out some words as a free action in between some of the standard attacks.