Questão jurídica principal
Whether the cantonal court assessed the evidence arbitrarily, especially the parties' statements about the attack and the presence of a wheel wrench.
Decisão extraída
No arbitrariness was shown; the Federal Court deferred to the cantonal findings.
Fundamentação extraída
The challenge was mainly appellatory. The cantonal court could credit X.'s account on the decisive points and reject Y.'s version under the narrow arbitrariness review applicable on appeal.