When do you call interference?

[Dakota]

Originally posted by IRISHMAFIA
[Tom,

I agree with just about everything you state here except that no where does it say the runner must be sliding to attain a base to avoid interference. All the rule and POE state is that sliding, going over, under or around is an option for the runner to avoid being ruled out for interference.

True, and I didn't mean to imply that a runner must slide. I meant to say a runner may slide to avoid an interference call. As you point out, he has other choices, too. However, he cannot remain on his feet and crash into the fielder with the ball.