  Holography on cutoff surfaces can appear to be in tension with causality. For
example, as argued by Omiya and Wei [arxiv:2107.01219], double holography
seemingly allows for superluminal signalling. In this paper we argue that the
brane description of double holography should be treated as an effective theory
and demonstrate that causality violations due to faster-than-light
communication are not visible above the associated cutoff length scale. This
suggests that end-of-the-world brane models are consistent with causality and
that the apparent superluminal signalling is a UV effect. Moreover, we argue
that short distance non-localities generically give rise to apparent
faster-than-light propagation of signals in Anti-de Sitter space.
  Nonetheless, superluminal signalling indicates that the causal structure on
holographic cutoff surfaces needs to be modified. We propose and study three
different candidate regions that might replace the domain of dependence in the
brane EFT of the Karch-Randall model. These regions are defined by unitarity on
the brane, through bulk entanglement wedges and through the nice slice
criterion, respectively. In all dimensions, these candidate regions exclude
those parts of the domain of dependence which are affected by superluminal
signalling. While all three definitions agree in two dimensions, they are
different in higher dimensions.
