I change back to Ernie before getting inside the Trustee Room

Hint 1 of 8:

Change your identity right before going down to the sewers.

Hint 2 of 8:

You are taking too long to get through the sewers.

Hint 3 of 8:

Do something to stop the flow through the active nodes.

Hint 4 of 8:

The flow is from people using the bathroom. Make them stop.

Hint 5 of 8:

Did you find the UGUGOOWAH box in the sewers ?

Hint 6 of 8:

CAST UGUGOOWAH.  Now you can safely go through active nodes.

Hint 7 of 8:

Exit the sewers in the Student Union.

Hint 8 of 8:

( this hint courtesy of Bill Larkin )