Conversation so far:
what did Kevin Sydney have to do with Proteus?
Morph (Kevin Sydney) helped the team take down Proteus by impersonating the Maestro and weakening Proteus with a steel strip in his head.
Is there any interesting information in the article about Kevin Sydney?
Kevin Sydney is a fictional character appearing in American comic books published by Marvel Comics.
How did Morph impersonate the Maestro?
Kevin Sydney aka Morph aka The Changeling has the ability to shapeshift.

Question: What powers did he use to take down Preteus?
Self-contained rewrite: What powers did Morph use to take down Proteus?