What three things does Bob Ewell do that alarms Aunt Alexandra?

From the very beginning of the book, we see that Bob Ewell
is not a very nice man. After Tom Robinson was killed, Bob is seen to be acting very
strangely by Aunt Alexandra. Aunt Alexandra is very protective of her
family.

In chapter 27 we see that three things happen to
make Aunt Alexandra and the rest of the town worried about Bob Ewell. The first thing
that happens is that Bob loses his job. He was never one to hold a job, but when he
loses his job it makes people start to wonder about him. When Judge Taylor sees someone
sneaking away from his house, Bob is the first one people think of. He has broken into
the Judge's house, and the third thing is that he starts to follow Tom's widow, Helen
around town.

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"Mr. Ewell kept the same distance behind her
until she reached Mr. Link Deas's house. All the way to the house, Helen said she heard
a soft voice behind her, crooning foul words. Thoroughly frightened, she telephoned Mr.
Link at his store, which was not too far from his house. As Mr. Link came out of his
store he saw Mr. Ewell leaning on the fence. Mr. Ewell said "Don't you look at me, Link
Deas, like I was dirt. I a'int jumped your."

"You don't
have to touch her. All you have to do is make her afraid, an if assault a'int enough to
keep you locked up awhile, I'll get you in on the Ladies Law, so you get outa my sight!
If you think I mean it, just bother that girl
again."

Mr. Ewell was nothing
but a coward. All he was able to do was scare people who were weaker than he was. He was
getting ready to meet the a person who was not afraid of him at
all.