zombie apocalypse part 2

Gasping for air, my lungs soar and my heart aching,
trudging through thick pools of mud, knee deep,
struggling to keep my rifle out of the dirt.
I treat myself to a quick rest and check behind me.
Dusk, the sun has but an hour left on its shift,
the mud writhes as crippled infected crawl there way through.
More are coming, over the crest of a hill.
I keep moving, I throw up from exhaustion, I keep moving,
I run till my feet bleed and my muscles pump acid.
I pass out...

Dawn, I open my eyes to the world and look around, where am I?
Birds tweet telling me all is safe, how long have i been out?
I check my pack and rifle, my supplies survived,
the look of my rifle fills me with doubt.
I take advantage of my situation and rest under an old tree,
I keep my eyes fixed on the north, some may have followed.
An hour or two passes and my rifle is much cleaner,
the sun sits high in the sky keeping watch over the barren landscape.
Two days pass...

Im woken by an ear splitting bang, a surge of urgency runs through me,
I gather my gear and start climbing a near by hill to see what made that noise,
in the distance i see a large mushroom cloud fill the horizon,
distant clatters of gun shots echo to me, there must be survivors.
I keep moving, little is to be gained from such an endeavor.

Some called me cruel or evil but i insisted i was clever,
thats why i left them, I said id brave the weather,
together, they said, together forever.
Never, id be carrying them like a weight on a tether.