If the character is on his phone texting, then his walk would need to be slower as if he has little clue of what is ahead of him and is distracted by the phone. The reaction time for the character felt too slow for the surprise it saw. The head also needs to lead the rest of the body with the turn around. The walk before the scare felt too bouncy and jerky and the walk back felt too slow and probably use a few more stepped to show the increased speed and panic run. Also to give a little more added panic, the character could’ve dropped his phone in reaction to seeing the spikes.