Stung by falling behind, Toulon again pinned the visitors in their own 22, with centre Williams providing an eye-catching tackle on Maama Molitika that smashed the flanker backwards.
On that occasion, Ospreys wing Tommy Bowe scored the late winning try, but their defensive effort caught Williams' eye after they missed only one tackle in 100 attempts.
So Kerry has to tackle one of the underlying concerns about Democrats in the public eye: Are they willing to be harsh -- ruthless if necessary -- to keep America safe, or are they too concerned about what other nations think?