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\item In \citet{http://adsabs.harvard.edu/abs/2013PhRvE..87d2723R} page 5, it is claimed that motion will be a superposition of longitudinal and transverse. Is this true -- won't one of them be unstable (in the case where work done in dragging is less than $T$, say)?  \item Same paper, page -- dimensional analysis. Try to do a better job than scaling argument: what are the coefficients? The fact that in the other paper they are off by some distance might be to do with this kind of thing.  \item Where does the nonequilibrium stuff happen? There is no mention of linear response or anything like that.  \end{enumerate}