The South African-born Londoner then chased ·¹Çø®Ä«½Å¹ß=·¹Çø®Ä«½Å¹ß Khan onto the bridge, where footage captured him and fellow members of the public fending off the attacker.
Khan was out on licence À̹ÌÅ×À̼ǼîÇÎ=À̹ÌÅ×À̼ǼîÇÎ from prison when he killed Mr Merritt and Ms Jones and injured three others in the stabbing attack.
Speaking to the PA news ³²ÀÚ·¹Çø®Ä«»çÀÌÆ®=³²ÀÚ·¹Çø®Ä«»çÀÌÆ® agency, Mr Frost said he was attending the rehabilitation event with colleagues when he heard a commotion downstairs.