(1) Face got covered in black lines: This means when one is stunned/ flurried causing a "pain in the head". This is commonly seen in anime and manga. It's the typical "Uh...." face. A more visual representation:
(2) A lot of face: It is the Chinese concept of "face" (aka 面子 or miànzi) refers to a cultural understanding of respect, honor and social standing. Actions or words that are disrespectful may cause somebody to "lose face" while gifts, awards and other respect-giving actions may "give face". Having a lot of face in this case is referred to as how arrogant Derick is because of how much "face" he knows he has.
(3) Ba-thump!: SFX for a heartbeat.
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《Wait Until Sunrise!》
Fantasy-"𝑌𝑜𝑢 𝑎𝑟𝑒 𝑎 𝑑𝑟𝑎𝑔𝑜𝑛.." -"𝑌𝑒𝑠..." -"𝑌𝑜𝑢 𝑠𝑝𝑒𝑎𝑘.." -"𝑌𝑒𝑠..." Dragons are seen as glorious beasts. But what's more brilliant is having the head of one in your name. These creatures are the hardest ones to kill, not to mention...