At what point is the Shield (p. 275) spell put into effect?
The Shield spell description states “Casting Time: 1 reaction, which you take when you are HIT by an attack...”
Does this mean that at the point when an attack is determined to have hit (in other words, after an enemy’s attack roll) I’m able (should I choose) to use my reaction to cast Shield and thusly add +5 to my AC? This being the case, I would wait to determine if a strike hit, consider their roll number and engage Shield if the +5 would be helpful. Otherwise, just take the hit.
I can sense that my inexperience is causing me to miss something obvious...