  The Gravity Collaboration detected a near-infrared hotspot moving around Sgr
A* during the 2018 July 22 flare. They fitted the partial loop the hotspot made
on the sky with a circular Keplerian orbit of radius $\simeq7.5\,r_{\rm g}$
around the supermassive black hole (BH), where $r_{\rm g}$ is the gravitational
radius. However, because the hotspot traversed the loop in a short time, models
in which the hotspot tracks the motion of some fluid element tend to produce a
best-fit trajectory smaller than the observed loop. This is true for a circular
Keplerian orbit, even when BH spin is accounted for, and for motion along a
RIAF streamline. A marginally bound geodesic suffers from the same problem; in
addition, it is not clear what the origin of an object following the geodesic
would be. The observed hotspot motion is more likely a pattern motion. Circular
motion with $r\simeq12.5\,r_{\rm g}$ and a super-Keplerian speed $\simeq0.8\,c$
is a good fit. Such motion must be pattern motion because it cannot be
explained by physical forces. The pattern speed is compatible with
magnetohydrodynamic perturbations, provided that the magnetic field is
sufficiently strong. Circular pattern motion of radius $\sim20\, r_{\rm g}$ on
a plane above the BH is an equally good alternative; in this case, the hotspot
may be caused by a precessing outflow interacting with a surrounding disk. As
all our fits have relatively large radii, we cannot constrain the BH spin using
these observations.
