Counter Traps and Chains

The basic rule is that Counter Traps can only be used against the card they are immediately following in a chain.

So for Counter Traps: So:
 * Chain Link 2 used against Chain Link 1 only
 * Chain Link 3 used against Chain Link 2 only
 * Chain Link 4 used against Chain Link 3 only
 * Chain Link 5 used against Chain Link 4 only
 * Chain Link 4 CANNOT be used against Chain Link 1's effect.
 * Player A activates "Raigeki".
 * Player B chains "Magic Jammer".
 * Player A chains "Seven Tools of the Bandit".
 * Player B cannot chain a second "Magic Jammer", "Magic Drain", etc. The only Counter Traps he may activate are ones that would [negate the previous step ("Seven Tools of the Bandit").

This also prevents "loading on" of "Magic Drains". So you cannot chain 2 "Magic Drains" to the same Spell Card, hoping your opponent won't be able to discard 2 Spell Cards to save his original Spell Card.