Michael,
I think you are confusing "in the act of fielding" with "making a play".
In Pete Booth's example with the fielder grabbing the R1 on his way to 2B, he is correct that this is Type B - some fielder must be in possession of the ball, or having been in possession, have released a throw in order for "a play" to be in progress. Since no fielder had yet gained possession, no play was being made on the obstructed runner at the time he was obstructed.
The BR on his way to 1B is a different case, explicitly stated in the rule, which dictates a Type A Obs call whether a play is being made on him or not.
JM
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