There is absolutely nothing in the rules to prevent a player from moving 5', making an attack, and then moving again. The rules explicitly allow this. This allows a player to move, make an attack, assess the situation and decide whether or not to move again, and then take whatever action they think is appropriate.
As moving only 5' does not draw AoO, and as the rules do NOT require you to state at the time that you take that move whether or not it will be your ENTIRE movement, this can cause problems.
This could result in a situation such as...
Player moves 5 feet and attacks a creature. Player kills the creature. Player decides to move again since the creature is now dead. GRRRR! If players movement was going to equal more than 5', the now dead creature should have taken an attack of opportunity when the player first moved. Rewind? Give the creature an 'after the fact' attack? What if that 'after the fact' attack kills the player? Does that mean that the monster is now ALIVE because it's attack of opportunity killed the player before the player killed the creature? This destroys continuity.
The only solution that I can see is some type of house rule.
As moving only 5' does not draw AoO, and as the rules do NOT require you to state at the time that you take that move whether or not it will be your ENTIRE movement, this can cause problems.
This could result in a situation such as...
Player moves 5 feet and attacks a creature. Player kills the creature. Player decides to move again since the creature is now dead. GRRRR! If players movement was going to equal more than 5', the now dead creature should have taken an attack of opportunity when the player first moved. Rewind? Give the creature an 'after the fact' attack? What if that 'after the fact' attack kills the player? Does that mean that the monster is now ALIVE because it's attack of opportunity killed the player before the player killed the creature? This destroys continuity.
The only solution that I can see is some type of house rule.