SAN JOSE — A key moment for jurors in Apple and Samsung’s latest courtroom showdown came nearly one month into trial.

Attorneys for Apple played a videotape deposition in which a Google lawyer confirmed that the Mountain View search company had stepped up to defend Samsung against infringement allegations for two of the patents in the case. For the eight-member panel, the deposition buttressed Samsung’s argument that it was caught in the crosshairs of a larger fight between Apple and Google.