The night went by without any interruption. Walker took the first watch and was kept company by Gill who was taking some of the regular wither spike arrows and slowly poking holes in the arrow heads. His goal was to set them up so that the holes would be opened when he fired an arrow to release the sleeping oils from the dreamland sheep.
This was a time consuming task but Walker got the chance to see Gil at work and shaping an arrow. It was also a good way for Walker to learn what Gil could and could not do while they traveled. Since Gil could make an arrow that could spread a poison like the sleeping oil from the dreamland sheep, then he should also be able to spread other things.
