I'm not sure cause the bonus says: "Your Holy Shock spell causes the next Holy Light you cast within 10 sec to have 0.3 sec reduced cast time."
That means the bonus strictly says 0.3s doesn't matter what is your current x% spell casting speed and doesn't matter if you cast Holy Light for 2s or 1s.
If the bonus said: "Your Holy Shock spell causes the next Holy Light you cast within 10 sec to increase your casting speed by x%" (or something like that) this would have more sense. Before this talent worked perfect and correct but now not and for example if you cast Holy Light for 1.32s => 1.02s with 4pT10. If you cast Holy Light for 1.56s => 1.26s with 4pT10

