Say what?

http://www.ssd.noaa.gov/goes/flt/t1/loop-jsl.html

What front interacting with the other front?

91L grew out of an MCV which developed within one of the thunderstorm complexes associated with the elongated trof over the Bahamas. I fail to see a "well-defined" cold front there. Trof, yes. Cold front, no. Clicking on the "fronts" portion of the Floater they do not list any fronts there, either, except the one coming off the east coast about to intercept 91L.

The deepest convection is still squarely, or I should say circularly, over the position of the original MCV.