Two people on one base

[tcblue13]

1 out
R1 on first
BR hits ball to LF and ball gets by F7
R1 holds up at second but BR keeps trotting and stops at second.
Ball arrives to F1 in the circle
DC starts yelling about an out at 2nd because 2 girls are on the same base.
The lone PU does not make a call and feels like explaining the rule to DC puts the O at an unfair disadvantage since the D ought to know how to get the out.
DC instructs F1 to pitch to the next batter.
OC requests time

1. Has playing action stopped on the previous play?
2. Does PU allow a batter to step in?
3. Does PU grant time to OC a) prior to F1 throwing a pitch b) after a subsequnt pitch?
4. Can OC fix the problem if time is granted since BR legally occupies 1B?
5. Once DC decides to pitch to batter does PU call time and send BR back to 1B?