For this trophy you have to avoid small bombs trowhing at you in
Scorch. Just run slowly (I mean don't do charge run), jumping away from bombs and keep chasing Bob till the end. If you get hit by Bob don't worry,
leave the level and come back. That will restart the whole area with this challange aswell. (Many people tells that jumping into the water and "die" will restart it too. It didn't worked for me
)