If it's a simple pop up and the player is right underneath and calling and another player runs him over, turning the easy play into a difficult play, then its an error on the player who ran the other one over...
If it's a gap shot in the OF and the RF & CF run into each other, its a hit. If the CF, 2B & SS all pull back AND one of them would've had to make an 'above ordinary effort' play to make the catch, you call it a hit.
In the situation described (pop up in the infield), you shouldn't score a hit. It's an error. One guy running another one over is an error IF one guy is clearly calling and the other one knocks him over.
No way this one is scored a hit in the bigs.
The pull back and let it drop implies neither had a play and you can go either way, player who should've made the play with ordinary effort gets E or home team scorer gives a hit. You have to be there and you have to know that it can be an E even if contact with the ball isn't made. The question to be answered is, "Could the defensive player have made the play with ordinary effort?" If the answer is yes, its an E.
A lot of scorers can't decide who to give the E to, so they score a hit. If neither player made an error (by the definition) it should be a hit.
A very simple infield pop-up without a 30 knt gale, sun or some other factor should be an E on somebody...