The Flesh Ward spell says
Any Phase: Cast and exhaust to ignore all Stamina loss being dealt to you from one source. Discard this spell if the Ancient One awakens.
Is a 'source' considered a physical entity or more so considered an action or event from some entity, i.e. can I use this to prevent stamina loss from a specific monster through several attacks received, eventually evade it (if say I simply had no capacity to have enough successes to kill it), then next turn still avoid stamina loss from it?