I agree with Sheilah on the sneaking up thing. I don't think Clark can hear absolutely everything all the time; calls for help are something he tunes in for. Like when you hear someone say your name in a whispered discussion, but don't actually know what they're saying about you.
As for him not being immovable, I understand that he's not rooted to the ground but I keep thinking about Jonathan slamming that baseball bat into his chest. Although, I suppose you're right and I can chalk it up to tension. When I'm holding myself from moving, I tense up and all of my focus is on whatever I'm trying not to move for, waiting for the second I can get to it (think of playing "Red Ligh, Green Light"). I think I'm much easier to shove then than at a normal time. Thanks for the help figuring this out guys; it actually helped explain a few more questions about Clark's attention and how that affects his powers and whatnot!
