Force runner question - ASA

[jmkupka]

I've had a related incident happen a handful of times, always resulting in a furious DC:

A tag play where the fielder's forearm or elbow is the only thing that contacts the runner (the glove at the end of that arm, holding the ball, never makes contact with the runner).

In all cases it was clearly a "safe" in my judgement, seems to be a black and white call, there must be leather contacting the runner, no?