For evolved stars with lower surface gravities, the nonthermal velocities suggested by the narrow components are at or just above the sound speed.
Nonthermal velocities computed from the widths of the broad components are always highly supersonic.
We propose that the broad components are diagnostics for microflare heating. Both of these properties are consistent with the properties of the solar explosive events. This discrepancy must be resolved before the connection between broad components and explosive events can be positively established.