Contradiction with Matthew 28:9
This verse depicts people meeting Jesus with joy and worship after His resurrection, contrasting with the overwhelming force that causes people to fall back in John 18:6.
Matthew 28:9: And as they went to tell his disciples, behold, Jesus met them, saying, All hail. And they came and held him by the feet, and worshipped him.
Contradiction with Mark 5:6-7
In this instance, a man possessed by demons runs to Jesus and worships Him, unlike the retreat in terror described in John 18:6 when Jesus identifies Himself.
Mark 5:6-7: But when he saw Jesus afar off, he ran and worshipped him,
Contradiction with John 20:11-16
Mary Magdalene approaches Jesus outside the tomb with confusion and sorrow, which is inconsistent with the reaction of falling experienced by those in John 18:6.
John 20:11-16: But Mary stood without at the sepulchre weeping: and as she wept, she stooped down, [and looked] into the sepulchre,
Contradiction with Luke 24:36-37
The disciples are startled and frightened at Jesus' appearance, rather than physically falling backward as in John 18:6.
Luke 24:36-37: And as they thus spake, Jesus himself stood in the midst of them, and saith unto them, Peace [be] unto you.