Obstruction, or let them play?

[teebob21]

Two situations came up yesterday where I was doubting myself after the play if I should have had a "nothing" instead of calling obstruction. The runner did not advance beyond the protected base. NCAA ruleset, if it matters.

1: R1 on 1B steals. Both F4 and F6 go to 2B to take the throw and due to the miscommunication, the ball splits the defenders and sails into center field. F4 runs into R1, who is coming into 2B standing up.

2: R1 on 2B, R2 on 1B. A sharp grounder is hit to F6, who dives and misses the ball and it goes into left-center. As she is sliding on the ground, R1 steps on her and stumbles.

I had obstruction both times, even though it had no effect on the result. Correct call?