Halliday & Matthiessen (2014: 242):
[The Attribute] enters into ‘material’ clauses in a restricted way. In certain clauses with an ‘elaborating’ outcome, the Attribute may be used to construe the resultant qualitative state of the Actor or Goal after the process has been completed … Such Attributes are called resultative Attributes. They are only marginal participants. While they are unlike cicumstances in that they are not marked by prepositions, they are also unlike true participants in that they cannot serve as Subject. There is in fact a closely related circumstance — the resultative Rôle or ‘product’ …