स शरैरर्पितः क्रुद्धः सर्वगात्रेषु राघवः।
रराज समरे रामो विधूमोऽग्निरिव ज्वलन्॥
sa śarair arpitaḥ kruddhaḥ sarva-gātreṣu rāghavaḥ
rarāja samare rāmo vidhūmo ’gnir iva jvalan
saḥ = the; śaraiḥ = by arrows; arpitaḥ = when was grazed; kruddhaḥ = became angry; sarva-gātreṣu = all over His body; rāghavaḥ = descendant of Raghu; rarāja = and shone; samare = in the battle; rāmaḥ = Rāma; vidhūmaḥ = [and] smokeless; agniḥ = flame; iva = like; jvalan = a blazing.
When the descendant of Raghu was grazed by arrows all over His body, Rāma became angry and shone in the battle like a blazing [and] smokeless flame.
1 Śrīmad-Bhāgavatam 3.18.14-19: sṛjann amarṣitaḥ śvāsān manyu-pracalitendriyaḥ, āsādya tarasā daityo gadayā nyahanad dharim; bhagavāṁs tu gadā-vegaṁ visṛṣṭaṁ ripuṇorasi, avañcayat tiraścīno yogārūḍha ivāntakam; punar gadāṁ svām ādāya bhrāmayantam abhīkṣṇaśaḥ, abhyadhāvad dhariḥ kruddhaḥ saṁrambhād daṣṭa-dacchadam; tataś ca gadayārātiṁ dakṣiṇasyāṁ bhruvi prabhuḥ, ājaghne sa tu tāṁ saumya gadayā kovido ’hanat; evaṁ gadābhyāṁ gurvībhyāṁ haryakṣo harir eva ca, jigīṣayā susaṁrabdhāv anyonyam abhijaghnatuḥ; tayoḥ spṛdhos tigma-gadāhatāṅgayoḥ kṣatāsrava-ghrāṇa-vivṛddha-manyvoḥ, vicitra-mārgāṁś carator jigīṣayā vyabhād ilāyām iva śuṣmiṇor mṛdhaḥ.
“Smokeless” indicates that He blazed greatly.
NOTE. Why did Lord Rāma, the Supreme Personality of Godhead, not kill the demon Khara immediately? The answer is that when Supreme Lord fights with a demon in His pastimes, He plays with him for a while—sometimes defeating him and sometimes being defeated by him—before killing him.
For instance, when Hiraṇyākṣa fought with Lord Varāha, the following took place:
Hissing indignantly, all his senses shaken by wrath, the demon quickly sprang upon the Lord and dealt Him a blow with his powerful mace. The Lord, however, by moving slightly aside, dodged the violent mace-blow aimed at His breast by the enemy, just as an accomplished yogī would elude death. The Personality of Godhead now exhibited His anger and rushed to meet the demon, who bit his lip in rage, took up his mace again and began to repeatedly brandish it about. Then with His mace the Lord struck the enemy on the right of his brow, but since the demon was expert in fighting, O gentle Vidura, he protected himself by a maneuver of his own mace. In this way, the demon Haryakṣa and the Lord, the Personality of Godhead, struck each other with their huge maces, each enraged and seeking his own victory. There was keen rivalry between the two combatants; both had sustained injuries on their bodies from the blows of each other’s pointed maces, and each grew more and more enraged at the smell of blood on his person. In their eagerness to win, they performed maneuvers of various kinds, and their contest looked like an encounter between two forceful bulls for the sake of a cow.1
Śrīmad-Bhāgavatam then describes that Lord Brahmā, the leader of thousands of sages and transcendentalists, recognized this act to be a mere play on the part of the supremely omnipotent Lord. This is clear from Brahmā’s request to Lord Varāha to kill Hiraṇyākṣa immediately:
mainaṁ māyāvinaṁ dṛptaṁ niraṅkuśam asattamam
ākrīḍa bālavad deva yathāśīviṣam utthitam
“Lord Brahmā continued: My dear Lord, there is no need to play with this serpentine demon, who is always very skilled in conjuring tricks and is arrogant, self-sufficient and most wicked.” (Śrīmad-Bhāgavatam 3.18.24)
It is thus evident that right now, in the Rāmāyaṇa, Lord Rāma is similarly playing with Khara (before killing Him).