I had never really considered it might be a editing error.. but on rereading the POE's with an eye towards editing error.. it just might be. The POE's only address Runner Interference (by crash) with the Fielder in possession of the ball. On the other hand - it doesnt say they MUST have possession... it just addresses the situations with the player being discussed in possession.
The rule is still in the book though... so thats how I judge that play and how I already know that rule and enforce it - and I dont see a clarification on the site...but I could be missing it.
With us blues already being ratted-out on ezteams
for wantonly making up our own strike zone as we go along with complete disregard for DD pitchers.. i'm not so sure we should be disregarding a clearly written rule without some basis.