Double Edge Me

Two edges of a sword
and only one me.
Both sides are deadly.
Both sides are mean.
One side cuts you down
The other side just stares
then picks you up
before throwing you down the stairs.
Two edges of a sword
and only one me.
Both sides are harmless
Both sides are friendly
One sides hides from you
The other side just stares
then smiles at you
before helping you down the stairs
Two edges of a sword
and only one me.
Both sides are a lie.
Both sides are me.