How do I get past the guard in the bathroom

Hint 1 of 7:

You need to get him out of the way.

Hint 2 of 7:

Attack him, tie him up and gag him.

Hint 3 of 7:

"OPERATE Soldier".

Hint 4 of 7:

"EXAMINE boots" by table then "TAKE laces".

Hint 5 of 7:

"USE Laces on Soldier".