5:31 - Having the NBDFD and without a club, this is a more frequent check than bet at 40bb effective. Can chose weaker candidates to b/f. Good catch by Bryce btw, when you do have three spades + 9x/5x or QQ/JJ/TT it does becomes a frequenty check raise. Having no pair blocker or a straight draw to go with it decreases heavily the x/r frequency.