For that just add suppression to Clinging to the Barrier, cheap and doesn't allow anyone to cling to the wall.
For Example
Total Points: 67
Power Writeup: (Total: 85 Active Cost, 67 Real Cost) Barrier 10 PD/10 ED, 0 BODY (up to 15m long, 3m tall, and 1/2m thick) (Real Cost: 49) plus Dispel 6d6, Area Of Effect (15m Long, 3m Tall, 2m Wide Line; +1/2), Constant (+1/2) (36 Active Points); Linked (Barrier; -1/2), Only Effects Those Using Clinging For The Wall (-1/2) (Real Cost: 18)
END: 9