If you let go of the 'ready primary weapon' button for a moment, and then press it
again, then you retarget. However, it is slow.
If you press the down arrow, you not only back up, but you autotarget an enemy too. This is much faster.
With most weapons, firing means stopping, but a few (flamethrower, submachineguns) let
you walk or run while firing.
The designers of the game expect you to stop to shoot when you see a dino leap out of
the bushes ahead of you. Don't. They always set up a second dino to jump out right where
you are standing when the first one appears.
In fact, barely stop running at all. Stopping usually just gets you in trouble, except
at Third Energy Causeways when you have the submachineguns (see below)
You know how they warn you not to turn your back on the dinos? If you run past, you
can get a huge combo, if you dodge back and forth when they leap at you. Note: Only Dylan can pull this off, with his shotgun. Regina will get mobbed,
because she can hit only one target at a time until she gets the submachine guns
Buy magazines, as big as you can afford, or save for the bigger ones. You will need to
have lots of ammo.
The hand weapon enhancements (for the machete and the stun-whatever) are almost
worthless. Buy something else.
Regina's submachine guns are da bomb on the causeway at the Third Energy. I have
gotten a combo of twenty or something of those water dinosaurs, with the no damage bonus!
About the Third Energy ... The spring or waterfall or whatever is in the jungle near
where you started.
Some weapons must be bought to finish the game. The game tells you when you need it.
The birds are almost impossible to shoot, and they swarm you like all getout. Dodging
is the name of the game.
Read the notes you find. A couple are hidden, but they just describe dinos. However,
if you haven't seen a dinosaur one describes, then it is about to turn up.