Got pranked by Syed however it did not end well for him, make sure to check out his channel for the full video.
Self-defence in English law
Self-defence is a legal doctrine which says that a person may use reasonable force in the defence of himself or another. This defence arises both from common law and the Criminal Law Act 1967. Self-defence is a justification rather than an excuse, that is, the defence says that the person’s actions were not a crime at all.
Common law (self defence)
Self-defence in English law is a complete defence to all non-sexual offences involving the unlawful use of force (i.e. anything from battery to murder). In other words, it results in a complete acquittal of the defendant. Generally speaking, the rationale is that the defendant is not guilty of the offence because the force used was not unlawful.
Because the defence results in a complete acquittal, the courts have interpreted the defence in a restrictive way so as to avoid acquitting too easily. For example, the courts will not usually acquit the defendant just because he thought the force used was reasonable — whether or not the force used was reasonable will be objectively assessed by the jury and not simply according to what the defendant thought at the time.
“A defendant is entitled to use reasonable force to protect himself, others for whom he is responsible and his property. … It must be reasonable.” (Beckford v The Queen  AC 130)
Lord Morris in (Palmer v R  AC 814) stated the following about someone confronted by an intruder or defending himself against attack:
“If there has been an attack so that defence is reasonably necessary, it will be recognised that a person defending himself cannot weigh to a nicety the exact measure of his defensive action. If the jury thought that in a moment of unexpected anguish a person attacked had only done what he honestly and instinctively thought necessary that would be the most potent evidence that only reasonable defensive action had been taken…”