Shared ground
Isaiah 50:2–3 presents the speaker confronting a community that did not respond when he “came” and “called.” The silence is treated as a real failure of response, not a misunderstanding (textual claim: he came; no one was there; he called; none answered).
The speaker rejects the idea that rescue failed because he was unable. He raises the question only to dismiss it: his “hand” is not too short, and he does have power to deliver (textual claim: the speaker poses those questions to expose the false excuse).
To support this, he points to authority over creation: at his rebuke he can dry seas and rivers so thoroughly that fish die, and he can darken the heavens like mourning clothes (textual claim: drying waters; fish dying; darkening heavens). The images function as proof that the speaker’s reach is not limited.
Where interpretation differs (only where needed)
Who the “I” is. Some read the “I” as God speaking directly. Others read it as God speaking through his appointed servant or messenger, so that “I came / I called” describes God’s approach mediated through prophetic warning and invitation.
What “came” refers to. Some take it as God’s repeated historical “visits” in acts of deliverance and confrontation. Others take it more specifically as the sending of prophets (or particular moments of prophetic appeal), so the “coming” is the arrival of God’s word and summons.
How literal the nature language is. Some read the sea/sky language as referencing concrete past acts (echoing earlier deliverance stories). Others see it primarily as poetic imagery for God’s ability to judge and to reverse desperate situations, whether or not a specific event is in view.
Why the disagreement exists
The passage itself does not explicitly identify the speaker beyond “I,” and it blends personal address (“I came… I called”) with cosmic-scale claims (“I dry up the sea… I clothe the heavens”). That combination can be read as direct divine speech or as divine speech voiced through a representative. Also, prophetic writing often uses vivid nature imagery both for remembered events and for symbolic description, so readers differ on how tightly to link these lines to a particular historical episode.
What this passage clearly contributes
It frames the community’s crisis as a response problem (“none to answer”) rather than a power problem in the Redeemer. The speaker’s ability to redeem is defended by pointing to unmatched authority—his rebuke can collapse normal life-support systems (water) and even turn the sky into a sign of mourning. The text pushes the reader to locate the obstacle in human non-response, not in any weakness of the one who rescues.