John T and Janicholson have it right. The misfiring plug is fouled so it's short-circuiting the spark for that plug but allowing a ground path for the good plug.
The question remains "why does pulling the good plug make the bad one fire?". I suspect you'll get the same results if you pull either plug; this is a phenomena you'll see with fouled plugs on more conventional distributor systems: pulling the wire off a bad plug can make it fire. What is happening is that the voltage must rise significantly to jump the gap between plug wire and plug. The voltage produced by an ignition coil is limited only by the spark gap; the wider the spark gap the greater the voltage. The higher voltage will arc across the fouled plug rather than discharging through the short.
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Today's Featured Article - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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