Water hazard is the chapter with the most sightings of the G-man in the entire series, with 4 sightings in total. Why did he appear so much in this part?
Perhaps because he was worried that Gordon would die because he was facing too many Combine forces too soon.
Is it possible to skip the HEV suit on the Hazard Course
1-Jump on the left or right pipe as in the picture
2-Jump to the door behind the HEV
3-Wait for the door to open and continue the Hazard Course
Edit: Noclip must be used to pass the long jump area