  The relative Gromov seminorm is a finer invariant than stable commutator
length where a relative homology class is fixed. We show a duality result
between bounded cohomology and the relative Gromov seminorm, analogously to
Bavard duality for scl. We give an application to computations of scl in graphs
of groups. We also explain how our duality result can be given a purely
algebraic interpretation via a relative version of the Hopf formula. Moreover,
we show that this leads to a natural generalisation of a result of Calegari on
a connection between scl and the rotation quasimorphism.
