Good point, although it's said not to intervene manually in an automatic strategy I think such political events you mentioned can hardly be predicted by any strategy using rules based more or less on statistic price/volume/etc. behaviour from the past and maybe it can be useful to stop it for the moment and continue short after if you do not want to play lottery. Last personal experience was missing to close a short EUR/GBP trade before the weekend of the election in UK where May lost her majority ...