A teenager who attacked a teacher and said ‘the stupid cow deserves it’ has been spared prison.

Carol Shaw, who worked at St Paul’s Academy in Dundee, was seriously injured after Keiran Matthew grabbed her and dumped her head-first on a concrete floor.

She was knocked unconscious after being thrown ‘like a ragdoll’ to the ground, and left lying in a pool of her own blood while Matthew played on his phone and put his feet up on another teacher’s desk.

Matthew, who was 17 at the time of the attack but is now 18, walked free from court after his sentence fell within Scottish rules on avoiding short-term prison sentences for first offenders.

The attack happened after Matthew refused to get changed separately from other pupils for a PE class.

The measure had been agreed by Matthew, his fos

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