You might need to provide the definition for 'synergistically' for said newbie. maybe that's why he hasn't responded yet.
this should really clear it up:
syn·er·gis·tic
[sin-er-jis-tik] Show IPA
adjective
1
: having the capacity to act in synergism <synergistic drugs>
2
: of, relating to, or resembling synergism <a synergistic reaction>
— syn·er·gis·ti·cal·ly adverb