Dave Bonta's poem is only a few words long, but it packs in a surprising amount. The title, "Editor," sets up the puzzle. Then an owl appears, and the poem seems to ask it a question: "who are you now". The wording is a little playful, since "who" echoes the sound owls are famous for, so the question could be the bird's own call.
The answer comes in the last two lines. The speaker is "above in the dark," like an owl perched out of sight, and then the image shifts to "a red pen." The bird has turned into the editor's tool. Both owl and editor watch quietly, notice what is wrong, and mark it.
The mood is dry, a bit eerie, and wryly funny. The speaker seems to see the editing role as both watchful and slightly predatory. Whether that feels proud or self-mocking is left for the reader to decide.