As it is a React ability (not Resolution), if it causes one posse to become empty, it will not immediately stop the shootout, and so the other player will still have to take casualties (if applicable). (Source)
If the equipped dude is saved with Arnold McCadish or Lay On Hands, you cannot activate the React ability. (Source)
Once you assign casualties to a dude, removing him from the shootout will not prevent you from having to resolve these casualties. (Source)
'Affects' means 'Has a direct effect on your dude. Including boot/discard/ace your dude, turn him from stud to draw, increase/decrease bullets/influence/value. Does not include an indirect effect such as discarding an attached goods even if the loss of the goods affects the dude.' (Source)
Controlling the town square means you can attach goods to your dudes there by Shoppin' or Tradin', attach Totems to the town square itself (Source), and also use Stagecoach Office to bring in new dudes there.
If the React ability is used, effects that trigger on a dude being aced (The Brute, The Undertaker) do not trigger. (Source)
If a dude is supposed to be aced to cover casualties but is saved with the Tonic's ability, that dude is now considered as being discarded as a casualty, and thus can be further saved by Arnold McCadish. (Source)
Acing a dude is part of the cost ("do X to do Y" format), thus React abilities cannot be used to save that dude from being aced (Dr. Emanuel Ashbel, Vitality Tonic, Lay On Hands), but a Harrewed dude will get discarded, not aced. (Source)
Will set casualties to zero after Takin' Ya With Me and Hot Lead Flyin' increase them, effectively negating these cards. (Source)
Only prevents non-wanted Deputies from gaining a bounty for participating in a shootout at your opponent's private location (breakin' and enterin'). Does not affect dudes who are already wanted, and dudes participating in a Kidnappin'.
The dude issuing a callout doesn't have to be the same dude that's wearing the Duster. (Source)
To attach something legally means to attach it to something it could legally attach to as it enters play. (Source) That also means you can only re-attch Totems to locations that you control where you have an unbooted Shaman. (Source)
Use the react ability only if your dude actually changed location.
If you use a Noon ability to move your dude and initiate a shootout (e.g. Run 'Em Down!), wait for the shootout to end before using the Stables' react ability to cycle a card and make another Noon play. (Source)
If you use a Shootout ability to send your only dude home (e.g. Personal Ornothopter), you can make another play before the shootout ends.
If you play A Secret Tunnel then react with Morgan Stables, you can make two additional Noon plays. (Source)
If you set your home's production to 0, spend all your money, then borrow from the bank during the gamblin' phase and lose lowball, you must repay to the bank during the following upkeep phase (next turn). (Source)
Playing an action card includes using an ability on that card.
Play this after your opponent declares the use of an ability, but before they pay any costs (ghost rock, booting cards, making a pull). Your opponent is still considered to have used that ability for this turn. (Source)
If played to counter a Headline action, no other Headlines can be played during this shootout. (Source)