i was listenin music on my ipod (it was on shuffle) and it suddenly played bleeding me (from metallica's load album) and i heard a tune in its intro (between 17s to 33s but you need to listen to it on your earphones cos it sounds quite low) almost same as that backgroung tune in catalyst intro and i was quite surprised.
Basically the same but a bit faster. Nothing extraordinary - it's impossible for a music world to exist without some similar/same melodies in different tracks. I'm sure Linkin Park didn't copy this, if that was what you thought happened.
someone was really looking for that similarity man. only noticed it since you mentioen dthe seconds its in.