Remark 56.5.3. Below we will use that for an affine morphism h : T \to S we have h_*\mathcal{G} \otimes _{\mathcal{O}_ S} \mathcal{H} = h_*(\mathcal{G} \otimes _{\mathcal{O}_ T} h^*\mathcal{H}) for \mathcal{G} \in \mathit{QCoh}(\mathcal{O}_ T) and \mathcal{H} \in \mathit{QCoh}(\mathcal{O}_ S). This follows immediately on translating into algebra.
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