A recent federal appeals court ruling may offer ammunition to energy business Drummond Co. Inc. in a defamation case against Florida litigation boutique Conrad & Scherer and a former partner there—human rights lawyer Terrence Collingsworth, who has drawn scrutiny for alleged witness payments. But the ruling is only part of a broader legal showdown that Collingsworth indicated on Tuesday he has no plans to abandon.

Earlier this month, the U.S. Court of Appeals for the Eleventh Circuit declined to reconsider a March 23 decision that sided with Drummond in the company’s defamation suit. The company has been pursuing defamation claims since 2011 against Conrad & Scherer and Collingsworth, who left that firm in 2015 and is now based at International Rights Advocates in Washington, D.C.