Ok, here’s a section from Gung Lik Kuen you that you can turn into a 2 person drill.

Both start with right side facing each other.
You steal step and make low attack to the leg.
Other person withdraws the right leg and gives you a left punch to the face at the same time.
You spin and grab/clear the left punch with your left. Continue with right forearm smash to the head/neck.
Other person prevents/slips out of the grab before it is complete, clears your left smash with his right. He transfers control of the clear to his left rising hand. He steal steps in to attack low to your leg.
Now you withdraw your right leg while punching to his face with your left.
Other person spins, grabs your attack, and smashes in with right forearm to your head/neck.
You slip out your left before his grab becomes solid, use your right to clear his right smash upwards, transfer control to your left upward hand, steal step to attack low to his leg.
That is one complete cycle. Continue back and forth until speed, agility, power, timing, sensitivity, endurance, explosiveness, etc are improved or you are exhausted.
In the video, his low and high attacks are more vertical than we like. And also too wide and telegraphing. We tend to be more 45 degree arcing down, so there is some sideways to our strikes.
This drill will let the partners train the close timing in escaping the steal step and spin advances.
This also trains the agility to change quickly between defensive and offensive footwork as did the other drill I suggested.
The partners also train the grab(or use a clear if you have gloves on) to open for the forearm strike. They also get to practice the proper timing to neutralize the grab opening.
In countering the high forearm strike, the defense uses Praying Mantis Ou Lou Choi timing with right and left hands to intercept and control, followed by the right low strike.
Both partners get to work on distance adjustments that enable effective attacks/escapes.
Another way to do a partner drill with this is to chase your partner down with the combination attack 10x, then switch immediately and make him chase you back with his 10 attacks.
Drilling this way, you try to cover as much distance as possible on the attacks to develop the ability to overrun your opponent.
The other person needs to escape just enough to make you miss, but still be in position to counter attack. He escapes far enough to make you really have to work to get him.
Good cardio drill, and more fun than running or biking.
Not my first choice for a practical combo, but I use it because you mentioned that low attack in another thread.
Good training exercise with the low/high transitions and the footwork.