It looks like perhaps hatch assistance came too early, as there are signs of what looks like yolk as well as blood.
At this point, though, blood vessels SHOULD have receded and yolk should be absorbed, if incubation temps were correct and you were not running a degree or two low, which can cause late hatches.
I'd follow the instructions in the assisted hatching article since the chick has already been cracked halfway out. Stop on any sign of blood, and please be careful if you have the chick on damp paper towels because as soon as you open that incubator, the temp and humidity will drop and those damp paper towels will become evaporative coolers. Replace them with a dry towel before proceeding.
Good luck, and if you see yolk between the legs, don't try to hatch!
At this point, though, blood vessels SHOULD have receded and yolk should be absorbed, if incubation temps were correct and you were not running a degree or two low, which can cause late hatches.
I'd follow the instructions in the assisted hatching article since the chick has already been cracked halfway out. Stop on any sign of blood, and please be careful if you have the chick on damp paper towels because as soon as you open that incubator, the temp and humidity will drop and those damp paper towels will become evaporative coolers. Replace them with a dry towel before proceeding.
Good luck, and if you see yolk between the legs, don't try to hatch!