Vertical stack
Back cuts under, receives pass on open side
Someone from stack (or handler cuts upline)
Throwing too fast we throw into a defender. Keep in mind we have no mark here and the short upfield gain of a quick throw does not gain us much/if any of a positional advantage.
Instead be aware of where their defender is. If they commit under for the upline D...
...
Hit them long for an easy score or big gain.