the party stood outside the gate of the lab:

Steve had a nail spiked bat in one hand. Dustin and Jonathan tagged along beside him. Nancy, Lucas and Max were on the look out. Steve kept the others in sight,, he was willing to protect them at any cost...though he couldn't keep himself safe

They could hear the roarings and screeches of the Demogorgon's inside the lab, they were prowling around the hospitals corridors, its screech bellowed through the halls of the lab, causing them to shudder, they look up the windows of the lab, seeing the form of the inhuman creatures rearing up and screaming as they sprint through the halls, on the constant look out for live prey.

what they don’t expect to find in a few minutes time is a test subject, just like eleven, locked up in one of the rainbow rooms, waiting for the perfect opportunity to escape the lab once and for all, you had extremely powerful telekinetic powers, you had dealt with one of these things before.