I'm not familiar with Gaurdians, but I loved the different feels of these two videos. The second one had a very "spy" movie feel to it, reinforced for me by the (looked like a P2 video card/flash memory card) shots and the briefcase at the end.

I really enjoyed what was happening at around :28 seconds. In both, the music picks up intensity and the clip (adjust tie, sweat drip) really held the tension.