Justices on the Delaware Supreme Court on Wednesday pushed a Merck attorney to justify his interpretation of liability in a contract, seeking an explanation for why the company has changed its stance and asking whether it’s attempting to conceal its true level of liability for talc litigation.

Merck is seeking confirmation that Bayer is liable for talc claims that have been filed against both companies since 2014, when Bayer bought product lines from Merck in a $14 billion deal. The Court of Chancery dismissed Merck’s claims in April.