Well, Creed is very selective when it comes to those who he protects. Unlike his counterparts Mako and Kraus, Creed is actually aware of their existence, and so he knows pretty much everything that happens in Mako's life. Because Creed is so protective of Mako, he's prone to helping those who are downtrodden (or those who he's fond of, and Amy, at this point, would fall under both of those categories), since Mako was quite the melancholic not too long ago.
I know, and it sucks, especially since I'm a movie lover. The thing about it is that I don't actually get scared by the movies themselves, it's just that I overthink them after they're over, and since I'm the naive type of person that thinks that "anything can happen"...well, it's a dangerous combination.