快速時點的發生

I don't know what its name in english, but this is the time when after resolve an effect / the time after a monster is summon , turn player can use priority to chain directly with speed spell 2 cards, whether the turn player choose either to use priority or not ,after priority the opponent can chain with speed spell 2 card.

example :
turn player play reinforcement of the army,after the effect is resolved,after the turn player choose to use priority or not(he only able to use spell speed 2 cards) , but your opponent can chain with mind crush!

is this the main reason why mind crush is limited? XD