PVS-Studio warning V669 for CryEngineSDK

void CTargetTrackThreatModifier::ModifyTargetThreat(
  IAIObject &ownerAI, IAIObject &targetAI,
  const ITargetTrack &track,
  float &outThreatRatio,
  EAITargetThreat &outThreat) const
{
  if (track.GetTargetType() > AITARGET_SOUND &&
      outThreat >= AITHREAT_AGGRESSIVE)
  {
    outThreatRatio = 1.0f;
  }
}

This suspicious code was found in CryEngineSDK project by PVS-Studio static code analyzer.
Warning message is:
V669 The 'outThreat' argument is a non-constant reference. The analyzer is unable to determine the position at which this argument is being modified. It is possible that the function contains an error. targettrackthreatmodifier.cpp 48

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