You don't avoid Static Shock, you immune it. If you can't immune it you run out and die, 'cause you can't risk the raid dmg in Phase 3. Check 10:07 / 11:39
here.
We're discussing Lei Shen, not any other fight, because no other fight in the tier matters at all. And that fight is simply incomparably harder on 25M, starting from getting the required comp (full immunity raid, including 2 DK's, 2 Monks, 4 Warlocks and ranged DPS that doesn't loose dps from heavy movement), to every single fight mechanic (Intermissions, Diffusion Chain, Balls of Lightning, you name it) being immensely more punishing than it is in 10M, as it requires perfect timing and positioning from 25 people. Unlike where, for example, in 10M, not just that you don't have to focus on it, but you can simply ignore Balls of Lightning and nuke the boss as they're spawning.
If you really want to discuss other bosses as well, just take a look at Ji-Kun and Iron Qon on 10M "heroic".