  Martin and Kok (2018a) measured two distinct aeolian saltation transport
thresholds: a larger threshold below which continuous saltation transport
becomes intermittent and a smaller threshold below which intermittent saltation
transport ceases. In the spirit of Bagnold, they interpreted the former
threshold as the \textit{fluid threshold}, associated with transport
initiation, and the latter threshold as the \textit{impact threshold},
associated with transport cessation. Here I describe and support an alternative
interpretation of these two thresholds as two distinct cessation thresholds
associated with splash entrainment and, respectively, with compensating energy
losses of rebounding particles. This interpretation was recently proposed by
P\"ahtz and Dur\'an (2018a). To resolve this controversy, further field studies
are needed.
