That's a Foul, March 2009
Variations and entries in flex.
a) Base action
Normal flex action on the first pass, 5 flex screens for 2 then 1 downscreens for 5.
If the ball is reversed to 5, teams often look at a backscreen after the flex screen, instead of a downscreen.
c) Post isolation
2 flex cuts on the pass to 4, 1 does not downscreen for 5.
On a return pass, 1 dribbles to create an angle for a post feed to 5, who looks to create a deep seal for the catch after screening for 2. 4 and 2 set a staggered screen for 3 on the other side of the floor.
See Offence - Maryland flex ("hold"), and Rick Majerus "naked post" in Offence - 4-out 1-in motion.
c) UCLA to hand-off
2 flex cuts on the pass to 4, 1 does not downscreen.
On a pass to 3, 4 UCLA cuts using 2's backscreen, looking to post up, 5 backscreens for 1.
On ball reversal to 5 he dribble hand-offs with 1.
d) Middle pick and roll to flex
4 ballscreens for 1 and dives if 1 can't turn the corner (look at a post feed), 5 comes high.
On a pass to 5 look for a high-low pass, then it's into flex action (note that 4 backscreens for 1).