Newcomers playing Basic Set for first time - some confusion about how to play some cards, such as Events
eg: (AH22) [Event: Evidence! Cost 1, Intel 2] Insight. Fast. Play after you defeat an enemy. Discover 1 clue at your location.
If i can play this card (by paying one resource?) immediately after i "defeat an enemy", why does the card show two intellect "skill test icons" in the upper left? The "Discover" implies that this is automatic and does not require a skill test - otherwise it should say something like, "do a bonus investigate action"?
Likewise: (AH23) [Event: Dodge. Cost 1, Willpower 1, Agility 1] Tactic. Fast. Play when an enemy attacks an investigator at your location. Cancel that attack.
This does not imply a skill test, so why the Willpower and Agility?
Are those Skill Test Icons applicable to other uses of the card? Where is this stated?