Sidenote:
Foresight is so vague, it can easily scale from completely useless to horribly overpowered, just by interpretation.
If it only grants that +2 bonus, as a result of what has been written above in the spell's description, then it's kinda useless. If it gives that bonus in situations, where you normally cannot react, but otherwise gives you a fair warning and the ability to execute the action to prevent whatever is about to hit you (i.e. stop before you move onto a trap), then it's fairly powerful, because often such an action can prevent any harm altogether with no roll necessary.
Bye
Thanee