Vulnurable to a hit vs Vulnurable to hit

Some examples from the web:

• System kicked back a hit on handwriting.
• A hit list of supernatural creatures.
• Let us know if you get a hit.
• CIA just got a hit on the boy.
• Kaleidoscope got a hit on our Mustang.
• Galindo lost a hit squad last week.
• Got a hit with those deputy interviews.
• Got a hit on the pawnshop registry.
• C-6 was a hit, c-8 was a hit.
• I need a hit, someone give me a hit.
• A hit man killed a hit man.
• So you think Janstar hired a hit man to silence...
• The woman put a hit out on me.
• The woman put a hit out on me.
• We got a hit fifth license plate in.
• The reason you took over a hit-and-run.
• Believe it or not, that song would probably be a hit.
• Could be a hit man posing as a federal marshal.
• Shadownet just coughed out a hit on Robbie.
• Research said Joey was going to be a hit.

Some examples from the web:

• Way to hit the suicide theme.
• The second bomb to hit Japan.
• Vulture Team preparing to hit the warehouse.
• - The lightning started to hit.
• He was planning to hit pd.
• He would have known exactly when to take it from the fire, which bits to forge, how hard to hit it, when to hit it, more importantly when not to hit it.
• You need to hit people because you need to hit people.
• The best way to hit this is head-on.
• Then she started to hit me.
• Then she started to hit me. I lost it.
• Hurricane Mary is due to hit tomorrow with strong winds and heavy rain.
• But there were plenty who wanted to hit that.
• It was almost like he wanted Jason to hit him.
• He has to hit bottom and know it.
• - Just try to hit the ball and have fun.
• Tell your piece to hit it.
• Naomi, I am not trying to hit on Dixon.
• I half expected you to hit me then.
• You tried to hit me with a Louisville Slugger.
• You're not supposed to hit the president.