Rocks hit Loki with conquers haki to give him a power up

When Rocks first met Loki he hit him with a very powerful attack. Seems strange Rocks would do this to a child and his friend Harald’s son. I believe he did this to pass on his power to Loki. In One Piece characters get stronger if they receive attacks and it doesn’t break their will. Rocks did this on purpose to make Harald’s son stronger and gain a follower.