Inevitably, it all kicked off in the end. Three games in two competitions over 10 days has forged some barely disguised contempt between Celtic and Dundee United. Six red cards tell their own tale. For Jackie McNamara’s team, the frustration — and indiscipline — is growing. Ryan McGowan became the fourth United player to see red in the dying minutes, seconds after Celtic’s Anthony Stokes was dismissed for a retaliatory kick at Paul Paton. Afterwards, Ronny Deila rounded on the Australian, claiming he could have injured substitute Liam Henderson ‘for life’. The open wounds enveloping this fixture are now there for all to see.