flowchart TB
  subgraph real["what ran"]
    direction TB
    R1["replay"] --> R2["cmd_draw"] --> R3["objc_msgSend<br/>(no stack frame of its own)"] --> R4["Metal: drawPrimitives"]
  end
  subgraph seen["what the sampled stack showed"]
    direction TB
    S1["replay<br/>(return address into replay)"] --> S2["leaf PC inside objc_msgSend<br/>(translated code, no symbol)"]
  end
  real ~~~ seen
  N["cmd_draw's own frame is missing: objc_msgSend did not push one,<br/>so its time looked like replay's. Read the return address in the disassembly first."]
  seen --- N