Let's talk obstruction rule ASA

[oppool]

In SIT:1 would you agree if the contact is very light or just a slight variation in B1 base path you would rule incendental instead of obstruction??Both player just being in the same area making a play either offensive or defense.

And what if the runner did something purposely on this play while F3 is turning to retrieve the ball such as change his path,stuck out a leg or in your opinion had the better chance of moving to avoid the contact do you rule interference??

On SIT:2 after the contact with F3 the runner is knock down and just walks back to 1st in umpire judgement would of made it to 3rd after the ball is back in and all plays have ceased you would then award B1 3rd correct??

Thanks

Don